WYSIWYG NPR: drawing strokes directly on 3D models. - Robert D. Kalnins; Lee Markosian; Barbara J. Meier; Michael A. Kowalski; Joseph C. Lee; Phillip L. Davidson; Matthew Webb; John F. Hughes; Adam Finkelstein (ACM Trans. Graph., 2002)

Coherent stylized silhouettes. - Robert D. Kalnins; Phillip L. Davidson; Lee Markosian; Adam Finkelstein (ACM Trans. Graph., 2003)