@Manual{color,
  Title          = {\texttt{color.dtx}},
  Author         = {David Carlisle},
  Organization   = {},
  Address        = {CTAN: \url{macros/latex/required/graphics/color.dtx}},
  Note           = {},
  year           = 1999,
}

@Manual{empheq,
  Title          = {\texttt{empheq.dtx}},
  Author         = {Morten Høgholm},
  Organization   = {},
  Address        = {CTAN: \url{macros/latex/contrib/empheq/}},
  Note           = {},
  year           = 2003,
}

@Manual{framed,
  Title          = {\texttt{framed.sty}},
  Author         = {Donald Arseneau},
  Organization   = {},
  Address        = {CTAN: \url{macros/latex/contrib/misc/framed.sty}},
  Note           = {},
  year           = 2003,
}

@Manual{voss-Math,
  Title          = {Mathmode},
  Author         = {Herbert Vo{\ss}},
  Organization   = {},
  Address        = {\url{http://www.perce.de/LaTeX/math/Mathmode-TeX.pdf}},
  Note           = {},
  year           = 2004,
}