@article{Qin:2015:UPG,
 author = {Qin, Hao and Sun, Xin and Hou, Qiming and Guo, Baining and Zhou, Kun},
 title = {Unbiased Photon Gathering for Light Transport Simulation},
 journal = {ACM Trans. Graph.},
 issue_date = {November 2015},
 volume = {34},
 number = {6},
 month = oct,
 year = {2015},
 issn = {0730-0301},
 pages = {208:1--208:14},
 articleno = {208},
 numpages = {14},
 url = {http://doi.acm.org/10.1145/2816795.2818119},
 doi = {10.1145/2816795.2818119},
 acmid = {2818119},
 publisher = {ACM},
 address = {New York, NY, USA},
 keywords = {BDPT, global illumination, photon mapping},
}