Lars Mündermann Peter MacMurchy Juraj Pivovarov Przemyslaw Prusinkiewicz Modeling lobed leaves. 60-67 2003 conf/cgi/2003 Computer Graphics International http://doi.ieeecomputersociety.org/10.1109/CGI.2003.1214448 db/conf/cgi/cgi2003.html#MundermannMPP03