@article{Weigand1991,
  author    = {Weigand, Christoph},
  title     = {A Solution to the Scheduling Problem Taking into Account Quality},
  series = {Operations research '91 : extended abstracts of the 16th Symposium on Operations Research held at the University of Trier at September 9 - 11, 1991 / [GM{\"O}OR]. Peter Gritzmann ... (eds.)},
  journal   = {Operations research '91 : extended abstracts of the 16th Symposium on Operations Research held at the University of Trier at September 9 - 11, 1991 / [GM{\"O}OR]. Peter Gritzmann ... (eds.)},
  publisher = {Physica-Verl.},
  address   = {Heidelberg},
  isbn      = {3790806080},
  pages     = {373 -- 375},
  year      = {1991},
  language  = {en}
}
@article{Mackenstein1991,
  author    = {Mackenstein, Hans},
  title     = {The role of Germany, Japan and the United States on the ECU-bond markets / Hans Wilhelm Mackenstein},
  series = {De pecunia. 3 (1991), H. 1},
  journal   = {De pecunia. 3 (1991), H. 1},
  isbn      = {1015-6283},
  pages     = {113 -- 150},
  year      = {1991},
  language  = {en}
}
@article{Weigand1992,
  author    = {Weigand, Christoph},
  title     = {Economic Machine Adjustment in the Case of Product Screening .E.v.Collani, Ch. Weigand},
  series = {Statistical Papers. 33 (1992)},
  journal   = {Statistical Papers. 33 (1992)},
  pages     = {171 -- 184},
  year      = {1992},
  language  = {en}
}
@article{Weigand1992,
  author    = {Weigand, Christoph},
  title     = {A new Approach for Optimal Control of a Production process},
  series = {Economic Quality Control. 7 (1992)},
  journal   = {Economic Quality Control. 7 (1992)},
  isbn      = {0940-5151},
  pages     = {225 -- 251},
  year      = {1992},
  language  = {en}
}
@book{Mackenstein1992,
  author    = {Mackenstein, Hans},
  title     = {The European system of central banks in relation to the Deutsche Bundesbank : a comparative study of the two institutions and their political and social environment / by Hans Wilhelm Mackenstein},
  address   = {Birmingham},
  pages     = {47 Bl.},
  year      = {1992},
  language  = {en}
}
@article{JacobsJarkePohletal.1993,
  author    = {Jacobs, Stephan and Jarke, Matthias and Pohl, Klaus and Bubenko, Janis},
  title     = {Requirements Engineering : An Integrated View of Representations, Process, and Domain / Jarke, Matthias ; Pohl, Klaus ; Jacobs, Stephan ; Bubenko, Janis ...},
  series = {Software engineering : 4th European Software Engineering Conference Garmisch-Partenkirchen, Germany, September 13 - 17, 1993 ; proceedings / ESEC '93. Ian Sommerville ... (eds.)},
  journal   = {Software engineering : 4th European Software Engineering Conference Garmisch-Partenkirchen, Germany, September 13 - 17, 1993 ; proceedings / ESEC '93. Ian Sommerville ... (eds.)},
  publisher = {Springer},
  address   = {Berlin [u.a.]},
  isbn      = {3-540-57209-0},
  pages     = {100 -- 114},
  year      = {1993},
  language  = {en}
}
@article{Jacobs1993,
  author    = {Jacobs, Stephan},
  title     = {CSCW for Requirements Engineering - Requirements Engineering for CSCW},
  series = {Proceedings of the Third European Conference on Computer Supported Cooperative Work : 13 - 17 September 1993, Milan, Italy ; ECSCW ' 93 / ed. by Giorgio de Michelis ...},
  journal   = {Proceedings of the Third European Conference on Computer Supported Cooperative Work : 13 - 17 September 1993, Milan, Italy ; ECSCW ' 93 / ed. by Giorgio de Michelis ...},
  publisher = {Kluwer},
  address   = {Dordrecht [u.a.]},
  isbn      = {0-7923-2447-1},
  pages     = {XI, 364 S. : Ill., graph. Darst.},
  year      = {1993},
  language  = {en}
}
@article{Weigand1993,
  author    = {Weigand, Christoph},
  title     = {On the Effects of SPC on Production Time},
  series = {Economic Quality Control. 8 (1993)},
  journal   = {Economic Quality Control. 8 (1993)},
  isbn      = {0940-5151},
  pages     = {23 -- 61},
  year      = {1993},
  language  = {en}
}
@article{SchulteZurhausenPoznanska1994,
  author    = {Schulte-Zurhausen, Manfred and Poznanska, K.},
  title     = {Kryteria klasyfikacji malych i srednich przedsiebiorstw = Kriterien zur Klassifizierung von kleinen und mittleren Unternehmen},
  series = {Przeglad Organizacji (1994)},
  journal   = {Przeglad Organizacji (1994)},
  pages     = {24 -- 27},
  year      = {1994},
  language  = {en}
}
@book{JacobsJarke1994,
  author    = {Jacobs, Stephan and Jarke, Matthias},
  title     = {Requirements information management : the NATURE approach / RWTH Aachen, Fachgruppe Informatik. M. Jarke},
  publisher = {RWTH, Fachgruppe Informatik},
  address   = {Aachen},
  pages     = {27 S : graph. Darst.},
  year      = {1994},
  language  = {en}
}