Andreas Petersik Bernhard Pflesser Ulf Tiede Karl Heinz Höhne Rudolf Leuwer Realistic Haptic Interaction in Volume Sculpting for Surgery Simulation. 194-202 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2673&spage=194 2003 conf/is4th/2003 IS4TH db/conf/is4th/is4th2003.html#PetersikPTHL03