@InProceedings{benthin:04:FreeFormRT,
	title	= { {Interactive} {Ray} {Tracing} {of} {Free-Form} {Surfaces}},
	author	= { Carsten Benthin and Ingo Wald and Philipp Slusallek },
	year	= { 2004 },
	pages	= { 99--106 },
	booktitle	= { {Proceedings} {of} {Afrigraph} }
}