author = {Yu, Insu and Cox, Andrew and Kim, Min H. and Ritschel, Tobias and Grosch, Thorsten and Dachsbacher, Carsten and Kautz, Jan},
 title = {Perceptual influence of approximate visibility in indirect illumination},
 booktitle = {APGV '09: Proceedings of the 6th Symposium on Applied Perception in Graphics and Visualization},
 year = {2009},
 isbn = {978-1-60558-743-1},
 location = {Chania, Crete, Greece},
 doi = {http://doi.acm.org/10.1145/1620993.1609971},
 publisher = {ACM},
 address = {New York, NY, USA},