@article{Hasselgren2005cgf,
author = {Jon Hasselgren and Tomas Akenine-M\"oller and Samuli Laine},
title = {A Family of Inexpensive Sampling Schemes},
journal = {Computer Graphics Forum},
volume = {24},
number = {4},
year = {2005},
pages = {843--848},
publisher = {Eurographics Association and Blackwell Publishing Ltd},
}