Goblins by SpheroidalWeathering. - Matthew Beardall; McKay Farley; Darius Ouderkirk; Jeremy Smith; Michael Jones; Parris K. Egbert (NPH, 2007)

Directable Weathering of Concave Rock Using Curvature Estimation. - Michael D. Jones; McKay Farley; Joseph Butler; Matthew Beardall (IEEE Trans. Vis. Comput. Graph., 2010)