@article{FoersterMontanariLepsaetal.2005,
  author    = {F{\"o}rster, Arnold and Montanari, Simone and Lepsa, Mihail Ion and L{\"u}th, Hans},
  title     = {High frequency investigation of graded gap injectors for GaAs Gunn diodes / Simone Montanari ; Arnold F{\"o}rster ; Mihail Ion Lepsa ; Hans L{\"u}th},
  series = {Solid-state electronics. 49 (2005), H. 2},
  journal   = {Solid-state electronics. 49 (2005), H. 2},
  isbn      = {0038-1101},
  pages     = {245 -- 250},
  year      = {2005},
  language  = {en}
}
@article{MikulicsMarsoCamaraMayorgaetal.2005,
  author    = {Mikulics, M. and Marso, M. and C{\´a}mara Mayorga, I. and Gusten, R. and Stancek, S. and Michael, E. A. and Schieder, R. and Wolter, M. and Buca, D. and F{\"o}rster, Arnold and Kordos, P. and L{\"u}th, H.},
  title     = {Photomixers fabricated on nitrogen-ion-implanted GaAs},
  series = {Applied physics letters. 87 (2005)},
  journal   = {Applied physics letters. 87 (2005)},
  pages     = {041106-1 -- 041106-3},
  year      = {2005},
  language  = {en}
}
@article{SpaeteFaberSchwarzeretal.2004,
  author    = {Sp{\"a}te, Frank and Faber, Christian and Schwarzer, Klemens and Hartz, Thomas},
  title     = {Comparison of solar hot water systems in solar settlements - decentralized or centralized systems?},
  series = {Proceedings / organised by: ISES Europe ... [Ed.: Deutsche Gesellschaft f{\"u}r Sonnenenergie e.V. - DGS, Munich ; PSE GmbH - Forschung Entwicklung Marketing, Freiburg]. - Vol. 1},
  journal   = {Proceedings / organised by: ISES Europe ... [Ed.: Deutsche Gesellschaft f{\"u}r Sonnenenergie e.V. - DGS, Munich ; PSE GmbH - Forschung Entwicklung Marketing, Freiburg]. - Vol. 1},
  publisher = {PSE},
  address   = {Freiburg [Breisgau]},
  isbn      = {3-9809656-1-9},
  pages     = {1-666-1-671},
  year      = {2004},
  language  = {en}
}
@article{KhedimSchwarzerFaberetal.2004,
  author    = {Khedim, Ahmed and Schwarzer, Klemens and Faber, Christian and M{\"u}ller, Christoph},
  title     = {Production d{\´e}centralis{\´e}e de l'eau potable {\`a} l'{\´e}nergie solaire},
  series = {Desalination. 168 (2004), H. 1-3},
  journal   = {Desalination. 168 (2004), H. 1-3},
  isbn      = {0011-9164},
  pages     = {13 -- 20},
  year      = {2004},
  language  = {en}
}
@article{FaberFritzscheSchwarzer2002,
  author    = {Faber, Christian and Fritzsche, Ulrich and Schwarzer, Klemens},
  title     = {Vergleich der Ergebnisse des quasidynamischen und station{\"a}ren Kollektortests nach En 12975-2 / Fritzsche, Ulrich ; Faber, Christian ; Schwarzer, Klemens},
  series = {Zw{\"o}lftes Symposium Thermische Solarenergie : 24. bis 26. April 2002 / [wiss. Gesamtleitung: Volker Wittwer. Veranst.: OTTI-Energie-Kolleg. Mitveranst.: Arbeitsgemeinschaft Kommunaler Versorgungsunternehmen zur Sparsamen Ernergie- und Wasserverwendung (ASEW), K{\"o}ln ...]},
  journal   = {Zw{\"o}lftes Symposium Thermische Solarenergie : 24. bis 26. April 2002 / [wiss. Gesamtleitung: Volker Wittwer. Veranst.: OTTI-Energie-Kolleg. Mitveranst.: Arbeitsgemeinschaft Kommunaler Versorgungsunternehmen zur Sparsamen Ernergie- und Wasserverwendung (ASEW), K{\"o}ln ...]},
  publisher = {OTTI-Energie-Kolleg},
  address   = {Regensburg},
  isbn      = {3-934681-20-4},
  pages     = {135 -- 139},
  year      = {2002},
  language  = {de}
}
@book{HafnerSchwarzerPlettnerMarlianietal.2000,
  author    = {Hafner, B. and Schwarzer, Klemens and Plettner-Marliani, J. and Wemh{\"o}ner, C. and Faber, Christian and Wenzel, T.},
  title     = {Entwicklung einer Heizungs-/Solarthermie "Toolbox" f{\"u}r die Simulationsumgebung MATLAB (EXP trademark) /SIMULINK (EXP trademark) : Abschlussbericht},
  publisher = {Fachhochschule Aachen},
  address   = {J{\"u}lich},
  pages     = {56 S.},
  year      = {2000},
  language  = {de}
}
@article{VelrajSeenirajHafneretal.1997,
  author    = {Velraj, R. and Seeniraj, R. V. and Hafner, B. and Faber, Christian and Schwarzer, Klemens},
  title     = {Experimental analysis and numerical modelling of inward solidification on a finned vertical tube for a latent heat storage unit},
  series = {Solar energy. 60 (1997), H. 5},
  journal   = {Solar energy. 60 (1997), H. 5},
  isbn      = {0038-092X},
  pages     = {281 -- 290},
  year      = {1997},
  language  = {en}
}
@article{FoersterGriebelIndlekoferetal.1998,
  author    = {F{\"o}rster, Arnold and Griebel, M. and Indlekofer, M. and L{\"u}th, H.},
  title     = {Transport through a buried double barrier single electron transistor at low temperatures},
  series = {Physica E: Low-dimensional Systems and Nanostructures. 2 (1998), H. 1-4},
  journal   = {Physica E: Low-dimensional Systems and Nanostructures. 2 (1998), H. 1-4},
  isbn      = {1386-9477},
  pages     = {502 -- 506},
  year      = {1998},
  language  = {en}
}
@article{FoersterMalzerHeberetal.1998,
  author    = {F{\"o}rster, Arnold and Malzer, S. and Heber, J. and Peter, M.},
  title     = {Vertical transport and relaxation mechanisms in d-doping superlattices. Malzer, S.; Heber, J.; Peter, M.; Eckl, S.; Elpelt, R.; Doehler, G. H.; F{\"o}rster, A.; L{\"u}th, H.},
  series = {Physica E: Low-dimensional Systems and Nanostructures. 2 (1998), H. 1-4},
  journal   = {Physica E: Low-dimensional Systems and Nanostructures. 2 (1998), H. 1-4},
  isbn      = {1386-9477},
  pages     = {349 -- 352},
  year      = {1998},
  language  = {en}
}
@article{FoersterRosenauerFischeretal.1998,
  author    = {F{\"o}rster, Arnold and Rosenauer, A. and Fischer, U. and Gerthsen, D.},
  title     = {Composition evaluation by lattice fringe analysis. Rosenauer, A.; Fischer U.; Gerthsen D.; F{\"o}rster A.},
  series = {Ultramicroscopy. 72 (1998), H. 3-4},
  journal   = {Ultramicroscopy. 72 (1998), H. 3-4},
  isbn      = {0304-3991},
  pages     = {121 -- 133},
  year      = {1998},
  language  = {en}
}
@book{SchwarzerKrings1996,
  author    = {Schwarzer, Klemens and Krings, Thomas},
  title     = {Demonstrations- und Feldtest von Solarkochern mit tempor{\"a}rem Speicher in Indien und Mali. - Als Ms. gedr. - (Berichte aus der Energietechnik)},
  publisher = {Shaker},
  address   = {Aachen},
  isbn      = {3-8265-1981-7},
  pages     = {V, 106 S. : Ill.},
  year      = {1996},
  language  = {de}
}
@book{SchwarzerMueller2001,
  author    = {Schwarzer, Klemens and M{\"u}ller, Christoph},
  title     = {Entwicklung und Optimierung eines neuartigen Meer- und Brackwasser-Entsalzungssystems : Schlußbericht ; kurze Darstellung zu den Rahmenbedingungen ... ; Projektdauer: 1.9.1999 bis 28.4.2001 / Projektleitung: Klemens Schwarzer. Projektingenieur: Christoph M{\"u}ller},
  publisher = {[Fachhochschule]},
  address   = {[Aachen]},
  pages     = {[11] Bl : graph. Darst.},
  year      = {2001},
  language  = {de}
}
@article{HelsperFissanMugglietal.1983,
  author    = {Helsper, Christoph and Fißan, H. J. and Muggli, J. and Scheidweiler, A.},
  title     = {Verification of Ionization Chamber Theory},
  series = {Fire Technology. 19 (1983), H. 1},
  journal   = {Fire Technology. 19 (1983), H. 1},
  isbn      = {1572-8099},
  pages     = {14 -- 21},
  year      = {1983},
  language  = {en}
}
@article{HelsperFissan1983,
  author    = {Helsper, Christoph and Fißan, H. J.},
  title     = {Calibration of the Polytec HC-15 and HC-70 Optical Particle Counters / Fißan, H. J. ; Helsper, C.},
  series = {Aerosols in the mining and industrial work environments, Vol. 3. Instrumentation, Marple, Virgil A. ; Liu, Benjamin Y.},
  journal   = {Aerosols in the mining and industrial work environments, Vol. 3. Instrumentation, Marple, Virgil A. ; Liu, Benjamin Y.},
  publisher = {Ann Arbor Science},
  address   = {Ann Arbor, Mich.},
  pages     = {825 -- 829},
  year      = {1983},
  language  = {en}
}
@article{HelsperFissanKasper1984,
  author    = {Helsper, Christoph and Fißan, H. J. and Kasper, W.},
  title     = {Kalibrierung der Partikelgr{\"o}ßenbestimmung von optischen Partikelz{\"a}hlern / Fißan, H. J.; Helsper, C. ; Kasper, W.},
  series = {3. Europ{\"a}isches Symposion Partikelmeßtechnik : [PARTEC, eine Veranstaltung der Reihe Partikel-Technologie N{\"u}rnberg ; N{\"u}rnberg, 9. - 11. Mai 1984 ; preprints] = 3. European Symposium on Particle Characterization / Veranst.: GVC, Gesellschaft Verfahrenstechnik und Chemieingenieurwesen im Verein Deutscher Ingenieure (VDI). Red. Bearb.: Kurt Leschonski},
  journal   = {3. Europ{\"a}isches Symposion Partikelmeßtechnik : [PARTEC, eine Veranstaltung der Reihe Partikel-Technologie N{\"u}rnberg ; N{\"u}rnberg, 9. - 11. Mai 1984 ; preprints] = 3. European Symposium on Particle Characterization / Veranst.: GVC, Gesellschaft Verfahrenstechnik und Chemieingenieurwesen im Verein Deutscher Ingenieure (VDI). Red. Bearb.: Kurt Leschonski},
  publisher = {NMA N{\"u}rnberger Messe- und Ausstellungsges.},
  address   = {N{\"u}rnberg},
  pages     = {263 -- 274},
  year      = {1984},
  language  = {de}
}
@article{HelsperNiessnerRoenicke1984,
  author    = {Helsper, Christoph and Nießner, R. and R{\"o}nicke, G.},
  title     = {Application of a Multistep Condensation Nuclei Counter as a Detector for Particle Surface Composition / Nießner, R.; Helsper, C.; R{\"o}nicke, G.},
  series = {Aerosols : science, technology, and industr. applications of airborne particles ; proceedings of the 1. Internat. Aerosol Conference held Sept. 17-21, 1984, Minneapolis, Minn., U.S.A / ed.: Benjamin Y. H. Liu},
  journal   = {Aerosols : science, technology, and industr. applications of airborne particles ; proceedings of the 1. Internat. Aerosol Conference held Sept. 17-21, 1984, Minneapolis, Minn., U.S.A / ed.: Benjamin Y. H. Liu},
  publisher = {Elsevier},
  address   = {New York [u.a.]},
  isbn      = {0444009477},
  pages     = {63 -- 66},
  year      = {1984},
  language  = {en}
}
@article{HelsperFissanThielen1983,
  author    = {Helsper, Christoph and Fißan, H. J. and Thielen, H. J.},
  title     = {Determination of Particle Size Distributions by Means of an Electrostatic Classifier / Fißan, H. J.; Helsper, C. ; Thielen, H. J.},
  series = {Journal of Aerosol Science. 14 (1983), H. 3},
  journal   = {Journal of Aerosol Science. 14 (1983), H. 3},
  isbn      = {0021-8502},
  pages     = {354 -- 357},
  year      = {1983},
  language  = {en}
}
@article{HelsperFissanKasper1984,
  author    = {Helsper, Christoph and Fißan, H. J. and Kasper, W.},
  title     = {Calibration of Optical Particle Counters with Respect to Particle Size / Fißan, H. J. ; Helsper, C.; Kasper, W.},
  series = {Particle and Particle Systems Characterization. 1 (1984), H. 1984},
  journal   = {Particle and Particle Systems Characterization. 1 (1984), H. 1984},
  isbn      = {1521-4117},
  pages     = {108 -- 111},
  year      = {1984},
  language  = {en}
}
@article{HelsperNiessner1985,
  author    = {Helsper, Christoph and Nießner, R.},
  title     = {Application of a Multistep Condensation Nuclei Counter as a Detector for Particle Surface Composition / Nießner, R. ; Helsper, C.},
  series = {Journal of Aerosol Science. 16 (1985), H. 3},
  journal   = {Journal of Aerosol Science. 16 (1985), H. 3},
  isbn      = {0021-8502},
  pages     = {201 -- 209},
  year      = {1985},
  language  = {en}
}
@article{HelsperBartzFissanetal.1985,
  author    = {Helsper, Christoph and Bartz, H. and Fißan, H. J. and Kousaka, Y. (u.a.)},
  title     = {Response Characteristics for Four Condensation Nucleus Counters to Particles in the 3 to 50 nm Diameter Range / Bartz, H. ; Fißan, H. J. ; Helsper, C.; Kousaka, Y. ; Okuyama, K. ; Keady, R. Fruin, S. ; McMurry, P. H.; Pui, D. Y. H. ; Stolzenburg, M. R.},
  series = {Journal of Aerosol Science. 16 (1985), H. 5},
  journal   = {Journal of Aerosol Science. 16 (1985), H. 5},
  isbn      = {0021-8502},
  pages     = {443 -- 456},
  year      = {1985},
  language  = {en}
}