Per H. Christensen. Faster Photon Map Global Illumination. J. Graphics Tools, 4(3):1-10, 1999. [doi]
@article{Christensen99-1,
title = {Faster Photon Map Global Illumination},
author = {Per H. Christensen},
year = {1999},
doi = {10.1080/10867651.1999.10487505},
url = {http://dx.doi.org/10.1080/10867651.1999.10487505},
researchr = {https://researchr.org/publication/Christensen99-1},
cites = {0},
citedby = {0},
journal = {J. Graphics Tools},
volume = {4},
number = {3},
pages = {1-10},
}