@incollection{ref,
author = {Alex Vlachos and John Isidoro and Chris Oat},
title = {Textures as Lookup Tables for Per-Pixel Lighting Computations},
booktitle = {Game Programming Gems 3},
editor = {Dante Treglia},
publisher = {Charles River Media},
year = {2002},
pages = {467--476}
}