@book{BaltzerKayser1982,
  author    = {Baltzer, Wolfgang and Kayser, Hans J.},
  title     = {Befolgung von Verkehrsbeeinflussungsanlagen in Tunneln in Abh{\"a}ngigkeit von der Ausstattung / H. J. Kayser ; W. Baltzer},
  publisher = {Bundesminister f{\"u}r Verkehr, Abt. Straßenbau},
  address   = {Bonn- Bad Godesberg},
  pages     = {82 S. : Ill., graph. Darst.},
  year      = {1982},
  language  = {de}
}
@book{AltSchumny1982,
  author    = {Alt, Helmut and Schumny, Harald},
  title     = {Programmierung mathematischer Algorithmen (Vieweg-Programmbibliothek Taschenrechner ; 1) / Helmut Alt ; Harald Schumny [Hrsg.]},
  publisher = {Vieweg + Teubner},
  address   = {Wiesbaden},
  isbn      = {3-528-04211-7},
  pages     = {92 S.},
  year      = {1982},
  language  = {de}
}