@misc{tikz, author = {Till Tantau}, title = {{\Tikz\ and \PGF\ manual}}, howpublished = {\url{http://sourceforge.net/projects/pgf}}, note = {$v.\ge 2.00$} } @misc{xcolor, author = {Uwe Kern}, title = {{Extending \LaTeX's color facilities: the \texttt{xcolor} package}} }