@Book{PostScript,
  Author         = {Kollock, Nikolai G.},
  Title          = {PostScript richtig eingesetzt: vom Konzept zum
                   praktischen Einsatz},
  Publisher      = {IWT},
  Address        = {Vaterstetten},
  year           = 1989,
}

@Manual{pstricks,
  Title          = {PSTricks - {\PS} macros for Generic TeX},
  Author         = {Timothy Van Zandt},
  Organization   = {},
  Address        = {\url{http://www.tug.org/application/PSTricks}},
  Note           = {},
  year           = 1993,
}


@Manual{pdftricks,
  Title          = {PSTricks Support for pdf},
  Author         = {Herbert Voss},
  Organization   = {},
  Address        = {\url{http://PSTricks.tug.org}},
  Note           = {},
  year           = 2002,
}

@Manual{miwi,
  Title          = {References for \TeX{} and Friends},
  Author         = {Michael Wiedmann and Peter Karp},
  Organization   = {},
  Address        = {\url{http://www.miwie.org/tex-refs/}},
  Note           = {},
  year           = 2003,
}


@Manual{pstlens:2001,
  Title          = {PST-lens - {\PS} macros for Generic TeX},
  Author         = {Denis Girou and Manuel Luque},
  Organization   = {},
  Address        = {\url{ftp://ftp.dante.de/tex-archive/graphics/pstricks/contrib/pst-lens/}},
  Note           = {},
  year           = 2001,
}

@Manual{pstoptic:2001,
  Title          = {Lentilles convergentes: {PST}-optic v. 0.2},
  Author         = {Manuel Luque},
  Organization   = {},
  Address        = {\url{http://members.aol.com/ManuelLuque2/optique.htm}},
  Note           = {},
  year           = 2001,
}

