@book{KoutzevlovTschapek1996,
  author    = {Koutzevlov, Atanas and Tschapek, Alexej},
  title     = {Software \& interface requirements specifications},
  series = {HGG-Dokument},
  volume    = {UPHGG.014.1},
  journal   = {HGG-Dokument},
  publisher = {Univ.},
  address   = {Potsdam},
  year      = {1996},
  language  = {en}
}
@article{HornKoutzevlovRaetschetal.1996,
  author    = {Horn, Erika and Koutzevlov, Atanas and R{\"a}tsch, Gunnar and Schubert, Wolfgang and Tschapek, Alexej},
  title     = {Software system specification},
  series = {HGG-Dokument},
  volume    = {UPHGG.010.4},
  journal   = {HGG-Dokument},
  publisher = {Univ.},
  address   = {Potsdam},
  year      = {1996},
  language  = {en}
}
@book{KoutzevlovSchubertTschapek1996,
  author    = {Koutzevlov, Atanas and Schubert, Wolfgang and Tschapek, Alexej},
  title     = {Software test plan \& test description},
  series = {HGG-Dokument},
  volume    = {UPHGG.016.1},
  journal   = {HGG-Dokument},
  publisher = {Univ.},
  address   = {Potsdam},
  year      = {1996},
  language  = {en}
}