@book{kopka1,
 author = {Helmut Kopka},
 title  = {{\LaTeX{}} {--} Eine {Einf"uhrung}},
 year   = 1990,
 publisher = {Addison Wesley (Deutschland)}
}

@book{kopka2,
  author = {Helmut Kopka},
  title  = {{\LaTeX{}} {--} {Erweiterungsm"oglichkeiten}},
  year   = 1991,
  publisher = {Addison Wesley (Deutschland)}
}

@book{Schwarz,
  author = {Norbert Schwarz},
  title  = {{Einf\"uhrung} in {\TeX{}}},
  year   = 1988,
  publisher = {Addison Wesley (Deutschland)}
}

@techreport{treiber,
  author = {Gerhard Wilhelms and Ingo Eichenseher and Thomas Mitulla},
  title  = {Treiber und {Zusatzprogramme} zu {\TeX{}}},
  institution = {Universit\"at Augsburg},
  year   = 1991,
  type   = {Institutsreport},
  number = 232
}

@techreport{rep2,
  author = {Thomas Mitulla and Gerhard Wilhelms},
  title  = {Installation und {Handhabung} von {\TeX{}} an der {Universit\"at}
           {Augsburg}},
  institution = {Universit\"at Augsburg},
  year   = 1991,
  type   = {Institutsreport},
  number = 231
}

@manual{gsapollo,
  title = {Getting Started with Domain/OS},
  organization = {Apollo Computer Inc.},
  year = 1988
}

@manual{bibtex,
  title = {\BibTeX{}ing},
  author = {Oren Patashnik},
  year = 1988
}