@book{Fassbender1989,
  author    = {Faßbender, Heinz},
  title     = {Implementierung der Call-by-Need Auswertungsstrategie f{\"u}r Macro Tree-to-String Transducer auf Nested-Stack Maschinen mit geschachtelten Ausgabeb{\"a}ndern},
  address   = {Aachen},
  year      = {1989},
  language  = {de}
}
@article{Hanrath1989,
  author    = {Hanrath, Wilhelm},
  title     = {Character tables of some factor groups of space groups},
  series = {Perfect groups / Derek F. Holt and W. Plesken},
  journal   = {Perfect groups / Derek F. Holt and W. Plesken},
  publisher = {Clarendon Press},
  address   = {Oxford},
  isbn      = {0-19-853559-7},
  pages     = {357 -- 359},
  year      = {1989},
  language  = {en}
}
@article{Alt1989,
  author    = {Alt, Helmut},
  title     = {Sechsunddreißig Spielarten der Verrechung : die Behandlung von Tilgungs- und Zinszahlungen},
  series = {Frankfurter Zeitung : Blick durch die Wirtschaft : Zeitung f{\"u}r Finanzen, Steuern, Recht und Management},
  journal   = {Frankfurter Zeitung : Blick durch die Wirtschaft : Zeitung f{\"u}r Finanzen, Steuern, Recht und Management},
  pages     = {vom 12.9.1989},
  year      = {1989},
  language  = {de}
}
@article{Alt1989,
  author    = {Alt, Helmut},
  title     = {Zinsberechnung nach dem Sparbuch-Modell},
  series = {Frankfurter Zeitung : Blick durch die Wirtschaft : Zeitung f{\"u}r Finanzen, Steuern, Recht und Management},
  journal   = {Frankfurter Zeitung : Blick durch die Wirtschaft : Zeitung f{\"u}r Finanzen, Steuern, Recht und Management},
  pages     = {vom 22.3.1989},
  year      = {1989},
  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{Alt1989,
  author    = {Alt, Helmut},
  title     = {Steuerreformgesetz 1990},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {Bd. 88},
  journal   = {Elektrizit{\"a}tswirtschaft},
  number    = {H. 1/2},
  issn      = {0013-5496},
  pages     = {78 -- 83},
  year      = {1989},
  language  = {de}
}
@article{Alt1989,
  author    = {Alt, Helmut},
  title     = {Steuerreformgesetz 1990},
  series = {Elektrizit{\"a}tswirtschaft},
  volume    = {Jg. 88},
  journal   = {Elektrizit{\"a}tswirtschaft},
  number    = {H. 2},
  issn      = {0947-0581 (E-Journal); 0340-7918 (Print)},
  pages     = {120 -- 121},
  year      = {1989},
  language  = {de}
}
@inproceedings{Baumann1989,
  author    = {Baumann, Marcus},
  title     = {Primary production and phytoplankton growth in the marginal ice zone of the Fram Strait and the interpretation of the field data with autecological experiments (Abstract)},
  series = {Oceanography and biology of Arctic seas : selected papers from the ICES Symposium on Marine Sciences of the Arctic and Subarctic Regions, held in Santander, 28 - 30 September 1987. (Rapports et proc{\`e}s-verbaux des r{\´e}unions / Conseil International pour l'Exploration de la Mer ; 188)},
  booktitle = {Oceanography and biology of Arctic seas : selected papers from the ICES Symposium on Marine Sciences of the Arctic and Subarctic Regions, held in Santander, 28 - 30 September 1987. (Rapports et proc{\`e}s-verbaux des r{\´e}unions / Conseil International pour l'Exploration de la Mer ; 188)},
  editor    = {Hempel, G.},
  publisher = {International Council for the Exploration of the Sea},
  address   = {Copenhagen},
  organization    = {Symposium on Marine Sciences of the Arctic and Subarctic Regions <1987, Santander>},
  pages     = {128},
  year      = {1989},
  language  = {en}
}
@incollection{KurbelPietsch1989,
  author    = {Kurbel, Karl and Pietsch, Wolfram},
  title     = {Projektmanagementebenen bei evolution{\"a}rer Softwareentwicklung},
  series = {Interaktive betriebswirtschaftliche Informations- und Steuerungssysteme},
  booktitle = {Interaktive betriebswirtschaftliche Informations- und Steuerungssysteme},
  editor    = {Kurbel, Karl and Mertens, Peter and Scheer, August W.},
  publisher = {De Gruyter},
  address   = {Berlin},
  isbn      = {3-11-012100-X},
  doi       = {10.1515/9783110847055-013},
  pages     = {261 -- 285},
  year      = {1989},
  language  = {de}
}