@Manual{pstricks2007,
  Title          = {PSTricks - {\PS} macros for Generic TeX. Version 1.5},
  Author         = {Timothy Van Zandt},
  Organization   = {},
  Address        =
  {\url{http://www.tug.org/tex-archive/graphics/pstricks/base/doc/pst-user.pdf}},
    Note           = {},
  year           = 2007,
}


@Manual{siart,
  Title          = {Befehls\"ubersicht f\"ur \texttt{PSTricks} (Version
  0.93},
  Author         = {Uwe Siart},
  Organization   = {},
  Address        =
  {\url{http://www.siart.de/typografie/pstricks-referenz.pdf}},
  Note           = {},
  year           = 2009,
}




@Book{PSTricks2,
  author	= {Herbert Vo\ss},
  title		= {\texttt{PSTricks} -- {G}rafik f\"ur \TeX{} und \LaTeX},
  edition	= {fünfte},
  publisher	= {DANTE -- Lehmanns},
  year		= {2008},
  address	= {Heidelberg/Hamburg}
}