http://www.research.att.com/sw/tools/graphviz/dotguide.pdf http://www.research.att.com/sw/tools/graphviz/neatoguide.pdf http://home.so-net.net.tw/oodtsen/wingraphviz/language/fontname.htm http://home.so-net.net.tw/oodtsen/wingraphviz/langu…