Warping and Partitioning for Low Error Shadow Maps. - Brandon Lloyd; David Tuft; Sung-Eui Yoon; Dinesh Manocha (Rendering Techniques, 2006)

Practical logarithmic shadow maps. - Brandon Lloyd; Naga K. Govindaraju; David Tuft; Steven E. Molnar; Dinesh Manocha (SIGGRAPH Sketches, 2006)