@inproceedings{Ren06,
 author = {Zhong Ren and Rui Wang and John Snyder and Kun Zhou and Xinguo Liu and Bo Sun and Peter-Pike Sloan and Hujun Bao and Qunsheng Peng and Baining Guo},
 title = {Real-time soft shadows in dynamic scenes using spherical harmonic exponentiation},
 booktitle = {SIGGRAPH '06: ACM SIGGRAPH 2006 Papers},
 year = {2006},
 isbn = {1-59593-364-6},
 pages = {977--986},
 location = {Boston, Massachusetts},
 doi = {http://doi.acm.org/10.1145/1179352.1141982},
 publisher = {ACM},
 address = {New York, NY, USA},
 }