@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}, }