An Empirical Comparison of Progressive and Wavelet Radiosity. - Andrew J. Willmott; Paul S. Heckbert (Rendering Techniques, 1997)

Face Cluster Radiosity. - Andrew J. Willmott; Paul S. Heckbert; Michael Garland (Rendering Techniques, 1999)

Hierarchical face clustering on polygonal surfaces. - Michael Garland; Andrew J. Willmott; Paul S. Heckbert (SI3D, 2001)