Sketching as a solid modeling tool. - Lynn Eggli; Beat D. Brüderlin; Gershon Elber (Symposium on Solid Modeling and Applications, 1995)

Inferring 3D models from freehand sketches and constraints. - Lynn Eggli; Ching-yao Hsu; Beat D. Brüderlin; Gershon Elber (Comput. Aided Des., 1997)