@article{FassbenderBuehler1999,
  author    = {Faßbender, Heinz and B{\"u}hler, Gerhard},
  title     = {Applying Ada, Java and CORBA for making a command and control information system platform independent},
  series = {Proceedings : (SIGAda '99) ; October 17 - 21, 1999 ; Crowne Plaza, Redondo Beach \& Marine Hotel, Redondo Beach, CA, USA / ACM SIGAda Annual International Conference},
  journal   = {Proceedings : (SIGAda '99) ; October 17 - 21, 1999 ; Crowne Plaza, Redondo Beach \& Marine Hotel, Redondo Beach, CA, USA / ACM SIGAda Annual International Conference},
  publisher = {ACM},
  address   = {New York, NY},
  isbn      = {1-58113-127-5},
  pages     = {83 -- 88},
  year      = {1999},
  language  = {en}
}
@article{FassbenderVogler1994,
  author    = {Faßbender, Heinz and Vogler, Heiko},
  title     = {A universal unification algorithm based on unification-driven leftmost outermost narrowing},
  series = {Acta Cybernetica. 11 (1994), H. 3},
  journal   = {Acta Cybernetica. 11 (1994), H. 3},
  isbn      = {0324-721x},
  pages     = {139 -- 167},
  year      = {1994},
  language  = {en}
}
@article{Zastrow1978,
  author    = {Zastrow, Udo},
  title     = {Zur Berechnung anisotroper Scheiben durch singul{\"a}re Integralgleichungen},
  series = {ZAMM - Zeitschrift f{\"u}r Angewandte Mathematik und Mechanik.},
  volume    = {58},
  journal   = {ZAMM - Zeitschrift f{\"u}r Angewandte Mathematik und Mechanik.},
  number    = {6},
  publisher = {Wiley-VCH},
  address   = {Berlin},
  isbn      = {1521-4001},
  doi       = {10.1002/zamm.19780580605},
  pages     = {T132 -- T133},
  year      = {1978},
  language  = {de}
}
@article{Zastrow1979,
  author    = {Zastrow, Udo},
  title     = {Anisotrope Scheiben mit gemischten Randbedingungen},
  series = {ZAMM - Zeitschrift f{\"u}r Angewandte Mathematik und Mechanik. 59 (1979), H. 5},
  journal   = {ZAMM - Zeitschrift f{\"u}r Angewandte Mathematik und Mechanik. 59 (1979), H. 5},
  isbn      = {1521-4001},
  pages     = {T218 -- T219},
  year      = {1979},
  language  = {de}
}
@article{Zastrow1980,
  author    = {Zastrow, Udo},
  title     = {Die Airysche Spannungsfunktion f{\"u}r die unendliche anisotrope, orthotrope und isotrope Scheibe},
  series = {ZAMM - Zeitschrift f{\"u}r Angewandte Mathematik und Mechanik. 60 (1980), H. 6},
  journal   = {ZAMM - Zeitschrift f{\"u}r Angewandte Mathematik und Mechanik. 60 (1980), H. 6},
  isbn      = {1521-4001},
  pages     = {T159 -- T160},
  year      = {1980},
  language  = {de}
}
@article{Zastrow1981,
  author    = {Zastrow, Udo},
  title     = {Die Einflußfunktionen der Einzelkraft und der Stufenversetzung in der anisotropen Vollebene},
  series = {Archive of Applied Mechanics - Ingenieur Archiv. 51 (1981), H. 1-2},
  journal   = {Archive of Applied Mechanics - Ingenieur Archiv. 51 (1981), H. 1-2},
  isbn      = {1432-0681},
  pages     = {89 -- 99},
  year      = {1981},
  language  = {de}
}
@article{Zastrow1985,
  author    = {Zastrow, Udo},
  title     = {Zum System der Einflußfunktionen f{\"u}r die unendliche anisotrope Scheibe mit statischen und geometrischen Singularit{\"a}ten},
  series = {Archive of Applied Mechanics - Ingenieur Archiv. 55 (1985), H. 2},
  journal   = {Archive of Applied Mechanics - Ingenieur Archiv. 55 (1985), H. 2},
  isbn      = {1432-0681},
  pages     = {124 -- 133},
  year      = {1985},
  language  = {de}
}
@article{Zastrow1982,
  author    = {Zastrow, Udo},
  title     = {Solution of plane anisotropic elastostatical boundary value problems by singular integral equations},
  series = {Acta Mechanica. 44 (1982), H. 1-2},
  journal   = {Acta Mechanica. 44 (1982), H. 1-2},
  isbn      = {1619-6937},
  pages     = {59 -- 71},
  year      = {1982},
  language  = {en}
}
@article{Zastrow1985,
  author    = {Zastrow, Udo},
  title     = {On the formulation of the fundamental solutions for orthotropic plane elasticity},
  series = {Acta Mechanica. 57 (1985), H. 3-4},
  journal   = {Acta Mechanica. 57 (1985), H. 3-4},
  isbn      = {1619-6937},
  pages     = {113 -- 122},
  year      = {1985},
  language  = {en}
}
@article{Mayer2007,
  author    = {Mayer, Claudia},
  title     = {Internet statt Zeitung? Nein, Internet und Zeitung!},
  series = {Aachener Zeitung. 08.01.2007 (2007)},
  journal   = {Aachener Zeitung. 08.01.2007 (2007)},
  year      = {2007},
  language  = {de}
}
@article{Mayer2006,
  author    = {Mayer, Claudia},
  title     = {Die Lebensbeichte des G{\"u}nter Grass},
  series = {Aachener Zeitung. 28.12.2006 (2006)},
  journal   = {Aachener Zeitung. 28.12.2006 (2006)},
  pages     = {8},
  year      = {2006},
  language  = {de}
}
@article{Mayer2006,
  author    = {Mayer, Claudia},
  title     = {Die Beichte eines Mahners an seinem Lebensabend. Das sp{\"a}te Bekenntnis des G{\"u}nter Grass. Analysierende R{\"u}ckschau auf sein SS-Eingest{\"a}ndnis},
  series = {Aachener Nachrichten. 28.12.2006 (2006)},
  journal   = {Aachener Nachrichten. 28.12.2006 (2006)},
  pages     = {8},
  year      = {2006},
  language  = {de}
}
@article{Mayer2008,
  author    = {Mayer, Claudia},
  title     = {Meine besten Rezepte},
  series = {Kinder, Karriere, Kochvergn{\"u}gen : Prominente Aachenerinnen verraten ihre besten Rezepte / Hrsg. von Claudia Dechamps . Fotos: Harald Kr{\"o}mer},
  journal   = {Kinder, Karriere, Kochvergn{\"u}gen : Prominente Aachenerinnen verraten ihre besten Rezepte / Hrsg. von Claudia Dechamps . Fotos: Harald Kr{\"o}mer},
  publisher = {Corporate Publishing Claudia Dechamps},
  address   = {Aachen},
  pages     = {30 -- 33},
  year      = {2008},
  language  = {de}
}
@article{SchubaWrona1999,
  author    = {Schuba, Marko and Wrona, Konrad},
  title     = {Electronic Commerce Transactions in a Wireless Environment / Schuba, Marko. ; Wrona, Konrad},
  pages     = {1 -- 9},
  year      = {1999},
  language  = {en}
}
@article{SchubaHaverkortSchneider2000,
  author    = {Schuba, Marko and Haverkort, Boudewijn R. and Schneider, Gaby},
  title     = {Performance evaluation of multicast communication in packet-switched networks / Schuba, Marko ; Haverkort, Boudewijn R. ; Schneider, Gaby},
  series = {Performance Evaluation. 39 (2000), H. 1-4},
  journal   = {Performance Evaluation. 39 (2000), H. 1-4},
  isbn      = {0166-5316},
  pages     = {61 -- 80},
  year      = {2000},
  language  = {en}
}
@article{SchubaWrona2000,
  author    = {Schuba, Marko and Wrona, Konrad},
  title     = {Mobile Chip Electronic Commerce: Enabling Credit Card Payment for Mobile Devices / Schuba, Marko ; Wrona, Konrad},
  pages     = {1 -- 6},
  year      = {2000},
  language  = {en}
}
@article{SchubaWrona2001,
  author    = {Schuba, Marko and Wrona, Konrad},
  title     = {Security for Mobile Commerce Applications / Schuba, Marko ; Wrona, Konrad},
  pages     = {1 -- 8},
  year      = {2001},
  language  = {en}
}
@article{SchubaWronaZavagli2001,
  author    = {Schuba, Marko and Wrona, Konrad and Zavagli, Guido},
  title     = {Mobile Payments - State of the Art and Open Problems / Wrona, Konrad ; Schuba, Marko ; Zavagli, Guido},
  series = {Electronic commerce : second international workshop ; proceedings / WELCOM 2001, Heidelberg, Germany, November 16-17, 2001. Ludger Fiege ... (ed.)},
  journal   = {Electronic commerce : second international workshop ; proceedings / WELCOM 2001, Heidelberg, Germany, November 16-17, 2001. Ludger Fiege ... (ed.)},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {978-3-540-42878-7},
  pages     = {88 -- 100},
  year      = {2001},
  language  = {en}
}
@article{SchubaBusboomHerwonoetal.2002,
  author    = {Schuba, Marko and Busboom, Axel and Herwono, Ian and Zavagli, Guido},
  title     = {Unambiguous Device Identification and Fast Connection Setup in Bluetooth / Busboom, Axel ; Herwono, Ian ; Schuba, Marko ; Zavagli, Guido},
  series = {European wireless 2002 : next generation wireless networks: technologies, protocols, services and applications ; technical sessions: 26 - 28 February 2002, tutorials: 25 February 2002, Centro Affari, Florence, Italy ; proceedings / sponsored by EUREL ... General chair: Luciano Lenzini},
  journal   = {European wireless 2002 : next generation wireless networks: technologies, protocols, services and applications ; technical sessions: 26 - 28 February 2002, tutorials: 25 February 2002, Centro Affari, Florence, Italy ; proceedings / sponsored by EUREL ... General chair: Luciano Lenzini},
  pages     = {1 -- 5},
  year      = {2002},
  language  = {en}
}
@article{ClaessensFuchsbergerGuentheretal.2003,
  author    = {Claessens, J. and Fuchsberger, A. and G{\"u}nther, C. and Horn, G. and Howker, K. and Hulsebosch, R.J. and Mitchell, C. and Paterson, K. and Preneel, B. and Schellekens, D. and Schuba, Marko},
  title     = {Pioneering Advanced Mobile Privacy and Security},
  pages     = {1 -- 17},
  year      = {2003},
  language  = {en}
}
@article{HulseboschGuentherHornetal.2004,
  author    = {Hulsebosch, R. J. and G{\"u}nther, C. and Horn, C. and Holtmanns, S. and Howker, K. and Paterson, K. and Claessens, J. and Schuba, Marko},
  title     = {Pioneering Advanced Mobile Privacy and Security},
  series = {Security for mobility},
  journal   = {Security for mobility},
  editor    = {Mitchell, Chris J.},
  publisher = {Institution of Electrical Engineers},
  address   = {London},
  isbn      = {9781849190886},
  doi       = {10.1049/PBTE051E_ch},
  pages     = {383 -- 432},
  year      = {2004},
  language  = {en}
}
@article{SchubaGerstenbergerLahaije2004,
  author    = {Schuba, Marko and Gerstenberger, Volker and Lahaije, Paul},
  title     = {Internet ID - Flexible Reuse of Mobile Phone Authentication Security for Service Access / Schuba, Marko ; Gerstenberger, Volker, ; Lahaije, Paul},
  pages     = {1 -- 7},
  year      = {2004},
  language  = {en}
}
@article{Alt1976,
  author    = {Alt, Helmut},
  title     = {Spannungs-Blindleistungs-Regelung mit gesteuerten Netzkennlinien},
  series = {Elektrotechnische Zeitschrift : Ausgabe A, Zeitschrift f{\"u}r elektrische Energietechnik : ETZ},
  volume    = {97},
  journal   = {Elektrotechnische Zeitschrift : Ausgabe A, Zeitschrift f{\"u}r elektrische Energietechnik : ETZ},
  number    = {7},
  publisher = {VDE-Verlag},
  address   = {Wuppertal},
  issn      = {0302-265x},
  pages     = {441 -- 446},
  year      = {1976},
  language  = {de}
}
@article{Alt1995,
  author    = {Alt, Helmut},
  title     = {Netzanschlußm{\"o}glichkeiten und energiewirtschaftliche Bewertung von Windkraftanlagen},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {Jg. 94},
  journal   = {Elektrizit{\"a}tswirtschaft},
  number    = {H. 19},
  issn      = {0013-5496},
  pages     = {1224 -- 1234},
  year      = {1995},
  language  = {de}
}
@article{Alt2000,
  author    = {Alt, Helmut},
  title     = {Benchmark der Netznutzungspreise},
  series = {Energiewirtschaftliche Tagesfragen : et ; Zeitschrift f{\"u}r Energiewirtschaft, Recht, Technik und Umwelt},
  volume    = {Bd. 50},
  journal   = {Energiewirtschaftliche Tagesfragen : et ; Zeitschrift f{\"u}r Energiewirtschaft, Recht, Technik und Umwelt},
  number    = {H. 11},
  issn      = {0013-743X},
  pages     = {846 -- 850},
  year      = {2000},
  language  = {de}
}
@article{Alt1989,
  author    = {Alt, Helmut},
  title     = {Die Bedeutung des Effektivzinses in der Finanzwirtschaft},
  series = {Betriebs-Berater : BB : Beil. 14 Finanz-Berater},
  journal   = {Betriebs-Berater : BB : Beil. 14 Finanz-Berater},
  issn      = {0340-7926},
  pages     = {31 -- 32},
  year      = {1989},
  language  = {de}
}
@article{Alt1989,
  author    = {Alt, Helmut},
  title     = {Einfluß der Kontof{\"u}hrungsmodelle auf den Effektivzins und die Restschuld bei Annuit{\"a}tendarlehen},
  series = {Betriebs-Berater : BB : Beil. 14 Finanz-Berater},
  journal   = {Betriebs-Berater : BB : Beil. 14 Finanz-Berater},
  issn      = {0340-7926},
  pages     = {32 -- 37},
  year      = {1989},
  language  = {de}
}
@article{Alt2002,
  author    = {Alt, Helmut},
  title     = {Belieferung von Kunden in fremden Netzgebieten},
  series = {EW : das Magazin f{\"u}r die Energie-Wirtschaft},
  volume    = {Bd. 101},
  journal   = {EW : das Magazin f{\"u}r die Energie-Wirtschaft},
  number    = {H. 1/2},
  issn      = {0013-5496},
  pages     = {26 -- 35},
  year      = {2002},
  language  = {de}
}
@article{Alt2005,
  author    = {Alt, Helmut},
  title     = {Wunschphantasie eines eingefleischten Kernenergiegegners : zur Rede von Bundesumweltminister J{\"u}rgen Trittin auf dem VDEW-Kongress 2005 "Die Energieversorgung der Zukunft"},
  series = {EW : das Magazin f{\"u}r die Energie-Wirtschaft},
  volume    = {Bd. 104},
  journal   = {EW : das Magazin f{\"u}r die Energie-Wirtschaft},
  number    = {H. 17/18},
  issn      = {0013-5496},
  pages     = {7},
  year      = {2005},
  language  = {de}
}
@article{Alt2005,
  author    = {Alt, Helmut},
  title     = {Versorgungssicherheit und Windenergie : Tatsachen und Fakten statt Mythen und Mysterien},
  series = {EW : das Magazin f{\"u}r die Energie-Wirtschaft},
  volume    = {Bd. 104},
  journal   = {EW : das Magazin f{\"u}r die Energie-Wirtschaft},
  number    = {H. 25},
  issn      = {0013-5496},
  pages     = {42 -- 45},
  year      = {2005},
  language  = {de}
}
@article{Alt2011,
  author    = {Alt, Helmut},
  title     = {Die Sonne bestimmt zunehmend die Spannung in der Steckdose : Lastflussberechnung einer Photovoltaikeinspeisung},
  series = {EW : das Magazin f{\"u}r die Energie-Wirtschaft},
  volume    = {Bd. 110},
  journal   = {EW : das Magazin f{\"u}r die Energie-Wirtschaft},
  number    = {H. 17/18},
  publisher = {VWEW-Energieverlag},
  address   = {Frankfurt, M.},
  issn      = {0013-5496},
  pages     = {24 -- 29},
  year      = {2011},
  language  = {de}
}
@article{Alt1970,
  author    = {Alt, Helmut},
  title     = {Entwicklungstendenzen der Sicherheit und der notwendigen Reserveleistung beim Verbundbetrieb der Kraftwerke},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {69},
  journal   = {Elektrizit{\"a}tswirtschaft},
  number    = {25},
  publisher = {VWEW-Energieverlag},
  address   = {Frankfurt/Main},
  issn      = {0013-5496},
  pages     = {672 -- 678},
  year      = {1970},
  language  = {de}
}
@article{Alt1972,
  author    = {Alt, Helmut},
  title     = {Digitale Berechnung der Betriebsdiagramme von Hochspannungsleitungen},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {71},
  journal   = {Elektrizit{\"a}tswirtschaft},
  number    = {4},
  publisher = {VWEW-Energieverlag},
  address   = {Frankfurt/Main},
  issn      = {0013-5496},
  pages     = {87 -- 92},
  year      = {1972},
  language  = {de}
}
@article{Alt1974,
  author    = {Alt, Helmut},
  title     = {Auswertung von Pr{\"u}fungsergebnissen auf elektronischen Rechenanlagen},
  series = {Angewandte Informatik},
  volume    = {16},
  journal   = {Angewandte Informatik},
  number    = {5},
  publisher = {Vieweg},
  address   = {Braunschweig},
  issn      = {0013-5704},
  pages     = {219 -- 222},
  year      = {1974},
  language  = {de}
}
@article{Alt1978,
  author    = {Alt, Helmut},
  title     = {Tabellenfreie Berechnung der Einkommensteuer mit Hilfe des programmierbaren Taschenrechners},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {77},
  journal   = {Elektrizit{\"a}tswirtschaft},
  publisher = {VWEW-Energieverlag},
  address   = {Frankfurt/Main},
  issn      = {0013-5496},
  pages     = {486 -- 489},
  year      = {1978},
  language  = {de}
}
@article{Alt1978,
  author    = {Alt, Helmut},
  title     = {Wirtschaftlichkeit von Investitionen},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {77},
  journal   = {Elektrizit{\"a}tswirtschaft},
  number    = {3},
  publisher = {VWEW-Energieverlag},
  address   = {Frankfurt/Main},
  issn      = {0013-5496},
  pages     = {73 -- 76},
  year      = {1978},
  language  = {de}
}
@article{Alt1979,
  author    = {Alt, Helmut},
  title     = {Isolierte Freileitungen, ein Betriebsmittel f{\"u}r schwierige Trassenf{\"u}hrung},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {Jg. 78},
  journal   = {Elektrizit{\"a}tswirtschaft},
  number    = {H. 10},
  issn      = {0013-5496},
  pages     = {250 -- 256},
  year      = {1979},
  language  = {de}
}
@article{Alt1980,
  author    = {Alt, Helmut},
  title     = {Kurzschlußstromberechnung},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {Jg. 79},
  journal   = {Elektrizit{\"a}tswirtschaft},
  number    = {H. 10},
  issn      = {0013-5496},
  pages     = {379 -- 382},
  year      = {1980},
  language  = {de}
}
@article{Alt1981,
  author    = {Alt, Helmut},
  title     = {Wirtschaftlichkeitsberechnung von Investitionen mit dem programmierbaren Taschenrechner},
  series = {3 R international : RRR ; Rohre, Rohrleitungsbau, Rohrleitungstransport},
  volume    = {Jg. 20},
  journal   = {3 R international : RRR ; Rohre, Rohrleitungsbau, Rohrleitungstransport},
  number    = {H. 10},
  issn      = {0340-3386},
  pages     = {561 -- 565},
  year      = {1981},
  language  = {de}
}
@article{Alt1982,
  author    = {Alt, Helmut},
  title     = {Statische oder dynamische Wirtschaftlichkeitsberechnung bei Investitionen zur Energieeinsparung},
  series = {Elektrow{\"a}rme international Edition B: Industrielle Elektrow{\"a}rme : IEW = Industrial applications of electro-heat : EWI ; Zeitschrift f{\"u}r das gesamte Gebiet der Elektrow{\"a}rme in Industrie, Gewerbe und Haushalt},
  volume    = {Jg. 40},
  journal   = {Elektrow{\"a}rme international Edition B: Industrielle Elektrow{\"a}rme : IEW = Industrial applications of electro-heat : EWI ; Zeitschrift f{\"u}r das gesamte Gebiet der Elektrow{\"a}rme in Industrie, Gewerbe und Haushalt},
  number    = {H. 3/4},
  issn      = {0340-3521},
  pages     = {166 -- 172},
  year      = {1982},
  language  = {de}
}
@article{Alt1983,
  author    = {Alt, Helmut},
  title     = {Einsatz programmierbarer Rechner im Sondervertragskundenbereich der Gasversorgung},
  series = {Das Gas- und Wasserfach : Ausgabe Gas, Erdgas : GWF},
  volume    = {Bd. 124},
  journal   = {Das Gas- und Wasserfach : Ausgabe Gas, Erdgas : GWF},
  number    = {H. 9},
  issn      = {0016-4909},
  pages     = {468 -- 471},
  year      = {1983},
  language  = {de}
}
@article{Alt1978,
  author    = {Alt, Helmut},
  title     = {Intervallschalter mit getrennt einstellbarer Pulszeit und Pulszahl},
  series = {Elektronik : Fachmedium f{\"u}r industrielle Anwender und Entwickler},
  volume    = {27},
  journal   = {Elektronik : Fachmedium f{\"u}r industrielle Anwender und Entwickler},
  number    = {H. 14},
  publisher = {WEKA Fachmedien},
  address   = {Haar},
  issn      = {0013-5658},
  pages     = {76},
  year      = {1978},
  language  = {de}
}
@article{Alt1983,
  author    = {Alt, Helmut},
  title     = {Auswertung von Belastungskennlinien},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {Bd. 82},
  journal   = {Elektrizit{\"a}tswirtschaft},
  issn      = {0013-5496},
  pages     = {208 -- 210},
  year      = {1983},
  language  = {de}
}
@article{Alt1985,
  author    = {Alt, Helmut},
  title     = {Vorteilsausgleich durch Versorgungsunternehmen f{\"u}r Ersatzleistungen Dritter},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {Jg. 104},
  journal   = {Elektrizit{\"a}tswirtschaft},
  issn      = {0013-5496},
  pages     = {440 -- 443},
  year      = {1985},
  language  = {de}
}
@article{Alt1985,
  author    = {Alt, Helmut},
  title     = {Multiplikativ oder additiv? Diskussionsbeitrag zu Preisanpassungsklauseln in der Gaswirtschaft},
  series = {Energiewirtschaftliche Tagesfragen : et ; Zeitschrift f{\"u}r Energiewirtschaft, Recht, Technik und Umwelt},
  volume    = {Jg. 35},
  journal   = {Energiewirtschaftliche Tagesfragen : et ; Zeitschrift f{\"u}r Energiewirtschaft, Recht, Technik und Umwelt},
  issn      = {0013-743X},
  pages     = {609 -- 611},
  year      = {1985},
  language  = {de}
}
@article{Alt1986,
  author    = {Alt, Helmut},
  title     = {Steuersenkungsgesetz-Auswirkungen und Berechnung},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {Jg. 85},
  journal   = {Elektrizit{\"a}tswirtschaft},
  issn      = {0013-5496},
  pages     = {238 -- 242},
  year      = {1986},
  language  = {de}
}
@article{Alt1986,
  author    = {Alt, Helmut},
  title     = {Dialoggesteuerte harmonische Analyse mit dem HP 41},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {Bd. 85},
  journal   = {Elektrizit{\"a}tswirtschaft},
  number    = {H. 4},
  issn      = {0013-5496},
  pages     = {139 -- 142},
  year      = {1986},
  language  = {de}
}
@article{Alt1986,
  author    = {Alt, Helmut},
  title     = {Dialoggesteuerte harmonische Analyse mit dem HP 41},
  series = {Elektrow{\"a}rme international Edition B : Industrielle Elektrow{\"a}rme : IEW = Industrial applications of electro-heat : EWI ; Zeitschr. f{\"u}r das gesamte Gebiet der Elektrow{\"a}rme in Industrie, Gewerbe und Haushalt},
  volume    = {Jg. 44},
  journal   = {Elektrow{\"a}rme international Edition B : Industrielle Elektrow{\"a}rme : IEW = Industrial applications of electro-heat : EWI ; Zeitschr. f{\"u}r das gesamte Gebiet der Elektrow{\"a}rme in Industrie, Gewerbe und Haushalt},
  number    = {H. 6},
  issn      = {0340-3521},
  pages     = {283 -- 287},
  year      = {1986},
  language  = {de}
}
@article{Alt1986,
  author    = {Alt, Helmut},
  title     = {Dialoggesteuerte Spannungs- und Belastungsberechnung im Netz eines Elektrizit{\"a}tsversorgungsunternehmens},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {Bd. 85},
  journal   = {Elektrizit{\"a}tswirtschaft},
  number    = {H. 23},
  issn      = {0013-5496},
  pages     = {906 -- 910},
  year      = {1986},
  language  = {de}
}
@article{Alt1987,
  author    = {Alt, Helmut},
  title     = {Effektivzinsberechnung bei industriellen oder gewerblichen Tilgungsdarlehen},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {Bd. 86},
  journal   = {Elektrizit{\"a}tswirtschaft},
  issn      = {0013-5496},
  pages     = {592 -- 595},
  year      = {1987},
  language  = {de}
}