@article{DBLP:journals/vc/WilkieTP01,
author = {Alexander Wilkie and
Robert F. Tobler and
Werner Purgathofer},
title = {Orientation lightmaps for photon tracing in complex environments},
journal = {The Visual Computer},
volume = {17},
number = {5},
year = {2001},
pages = {318-327},
ee = {http://dx.doi.org/10.1007/s003710100101},
bibsource = {DBLP, http://dblp.uni-trier.de}
}