Controllable Binary Csg Operators for "soft Objects". - Loïc Barthe; Brian Wyvill; Erwin de Groot (Int. J. Shape Model., 2004)

Rayskip: faster ray tracing of implicit surface animations. - Erwin de Groot; Brian Wyvill (GRAPHITE, 2005)

Constructing Infinite Comatrix Corings from Colimits. - Stefaan Caenepeel; Erwin de Groot; Joost Vercruysse (Appl. Categorical Struct., 2006)

A Sketch-Based Method to Control Deformation in a Skeletal Implicit Surface Modeler. - Masamichi Sugihara; Erwin de Groot; Brian Wyvill; Ryan M. Schmidt (SBIM, 2008)

Locally restricted blending of Blobtrees. - Erwin de Groot; Brian Wyvill; Huub van de Wetering (Comput. Graph., 2009)

Implicit Decals: Interactive Editing of Repetitive Patterns on Surfaces. - Erwin de Groot; Brian Wyvill; Loïc Barthe; Ahmad H. Nasri; Paul Lalonde (Comput. Graph. Forum, 2014)