Ray Differentials and Multiresolution Geometry Caching for Distribution Ray Tracing in Complex Scenes. - Per H. Christensen; David M. Laur; Julian Fong; Wayne L. Wooten; Dana Batali (Comput. Graph. Forum, 2003)

An Irradiance Atlas for Global Illumination in Complex Production Scenes. - Per H. Christensen; Dana Batali (Rendering Techniques, 2004)

Multiresolution radiosity caching for global illumination in movies. - Per H. Christensen; George Harker; Jonathan Shade; Brenden Schubert; Dana Batali (SIGGRAPH Talks, 2012)