@INPROCEEDINGS{Ritschel07,
	author = {Ritschel, T. and Grosch, T. and Kautz, J. and Mueller, S.},
	title = {Interactive Illumination with Coherent Shadow Maps},
	booktitle = {Eurographics Symposium on Rendering, June 25 - 27, Grenoble, France},
	year = 2007 }