Geometric continuity and convex combination patches. - John A. Gregory; Jörg M. Hahn (Comput. Aided Geom. Des., 1987)

A C2 polygonal surface patch. - John A. Gregory; Jörg M. Hahn (Comput. Aided Geom. Des., 1989)

Geometric continuous patch complexes. - Jörg M. Hahn (Comput. Aided Geom. Des., 1989)

What's wrong with Phong - Designers' appraisal of shading in CAD-systems - Jörg M. Hahn (CoRR, 2010)