Gerrit Voss Johannes Behr Dirk Reiners Marcus Roth A multi-thread safe foundation for scene graphs and its extension to clusters. 33-37 2002 conf/egpgv/2002 EGPGV http://doi.acm.org/10.1145/569673.569679 db/conf/egpgv/egpgv2002.html#VossBRR02