@inproceedings{FFBGSIG01,
 author = {Randima Fernando and Sebastian Fernandez and Kavita Bala and Donald P. Greenberg},
 title = {Adaptive shadow maps},
 booktitle = {SIGGRAPH '01: Proceedings of the 28th annual conference on Computer graphics and interactive techniques},
 year = {2001},
 isbn = {1-58113-374-X},
 pages = {387--390},
 doi = {http://doi.acm.org/10.1145/383259.383302},
 publisher = {ACM Press},
 address = {New York, NY, USA},
 }