Frank Drewes Berthold Hoffmann Dirk Janssens Mark Minas Niels Van Eetvelde Adaptive Star Grammars. 77-91 2006 conf/gg/2006 ICGT http://dx.doi.org/10.1007/11841883_7 db/conf/gg/icgt2006.html#DrewesHJME06