@book{Pietschmann1995,
  author    = {Pietschmann, Bernd P.},
  title     = {Sitzungsverhalten von Managern. Entwicklung und Anwendung einer Methode zur Ermittlung sitzungsbeeinflussender Faktoren},
  publisher = {Dt. Univ.-Verl.},
  address   = {Wiesbaden},
  isbn      = {3-8244-6225-7},
  pages     = {XXVII, 272 S. : graph. Darst.},
  year      = {1995},
  language  = {de}
}
@book{PietschmannVahs1997,
  author    = {Pietschmann, Bernd P. and Vahs, Dietmar},
  title     = {Einf{\"u}hrung in die Betriebswirtschaftslehre. Lehrbuch mit Beispielen und Kontrollfragen},
  publisher = {Sch{\"a}ffer-Poeschel},
  address   = {Stuttgart},
  isbn      = {3-7910-1030-1},
  pages     = {XX, 326 S. : graph. Darst.},
  year      = {1997},
  language  = {de}
}
@book{PietschmannGehle1998,
  author    = {Pietschmann, Bernd P. and Gehle, Daniela},
  title     = {Kommunen im Internet. Entwicklung einer konzeptionellen L{\"o}sung f{\"u}r einen Online-Informationsdienst f{\"u}r Kommunen im Internet},
  publisher = {Kommunal- u. Schul-Verl.},
  address   = {Wiesbaden},
  isbn      = {3-8293-0023-9},
  pages     = {VI, 109 S.: graph. Darst.},
  year      = {1998},
  language  = {de}
}
@book{Gerhardt2005,
  author    = {Gerhardt, Hans Joachim},
  title     = {Windsch{\"a}den : mit 6 Tabellen. - (Schadenfreies Bauen ; 37)},
  publisher = {Fraunhofer-IRB-Verl.},
  address   = {Stuttgart},
  isbn      = {3-8167-6670-6},
  pages     = {129 S. : zahlr. Ill., graph. Darst.},
  year      = {2005},
  language  = {de}
}
@book{GerhardtKramerJansen1977,
  author    = {Gerhardt, Hans Joachim and Kramer, Carl and Jansen, Hubert},
  title     = {Traglufthallen unter Windbelastung},
  publisher = {Westdt. Verl.},
  address   = {Opladen},
  isbn      = {3-531-02650-X},
  pages     = {39 S. : Ill., graph. Darst.},
  year      = {1977},
  language  = {de}
}
@book{Gerhardt1994,
  author    = {Gerhardt, Hans Joachim},
  title     = {Absaugung von großfl{\"a}chig austretenden Schadstoffen beim offenen Guttransport},
  address   = {Frankfurt/M},
  year      = {1994},
  language  = {de}
}
@book{Siedenbiedel2001,
  author    = {Siedenbiedel, Georg},
  title     = {Organisationslehre},
  publisher = {Kohlhammer},
  address   = {Stuttgart [u.a.]},
  isbn      = {3-17-016498-8},
  pages     = {XVI, 239 S. : graph. Darst.},
  year      = {2001},
  language  = {de}
}
@book{SiedenbiedelEislerMertz2000,
  author    = {Siedenbiedel, Georg and Eisler-Mertz, Christiane},
  title     = {Schl{\"u}sselqualifikationen im Marketing},
  publisher = {Fortis [u.a.]},
  address   = {K{\"o}ln [u.a.]},
  pages     = {281 S. : Ill., graph. Darst.},
  year      = {2000},
  language  = {de}
}
@book{Tietze1992,
  author    = {Tietze, J{\"u}rgen},
  title     = {Monotonie und Kr{\"u}mmung : Wechselbeziehungen bei Gesamtkosten- und St{\"u}ckkostenfunktionen},
  publisher = {Alano-Verl.},
  address   = {Aachen},
  isbn      = {3-89399-169-7},
  pages     = {VI, 51 S. : zahlr. graph. Darst.},
  year      = {1992},
  language  = {de}
}
@book{Tietze1992,
  author    = {Tietze, J{\"u}rgen},
  title     = {{\"O}konomische Interpretation optimaler Simplex-Tableaus},
  publisher = {Alano-Verl.},
  address   = {Aachen},
  isbn      = {3-89399-170-0},
  pages     = {VI, 33 S.},
  year      = {1992},
  language  = {de}
}