@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}
}
@article{JacobsJarkePohl1994,
  author    = {Jacobs, Stephan and Jarke, Matthias and Pohl, Klaus},
  title     = {Requirements Engineering 1993},
  series = {Automated software engineering : the international journal of automated reasoning and artificial intelligence in software engineering. Vol. 1 (1994), H. No. 1},
  journal   = {Automated software engineering : the international journal of automated reasoning and artificial intelligence in software engineering. Vol. 1 (1994), H. No. 1},
  isbn      = {0928-8910},
  year      = {1994},
  language  = {en}
}