Thomas Ullmann Daniel Beier Beat Brüderlin Alexander Schmidt Adaptive Progressive Vertex Tracing in Distributed Environments. 285-294 2001 conf/pg/2001 Pacific Conference on Computer Graphics and Applications http://csdl.computer.org/comp/proceedings/pg/2001/1227/00/12270285abs.htm db/conf/pg/pg2001.html#UllmannBBS01