T-spline simplification and local refinement. - Thomas W. Sederberg; David L. Cardon; G. Thomas Finnigan; Nicholas S. North; Jianmin Zheng; Tom Lyche (ACM Trans. Graph., 2004)

Two Stage Importance Sampling for Direct Lighting. - David Cline; Parris K. Egbert; Justin Talbot; David L. Cardon (Rendering Techniques, 2006)