An Approach to Visualizing Transparency in Computer-Generated Line Drawings. - Jörg Hamel; Stefan Schlechtweg; Thomas Strothotte (IV, 1998)

An Illustration Technique Using Hardware-Based Intersections. - Oliver Deussen; Jörg Hamel; Andreas Raab; Stefan Schlechtweg; Thomas Strothotte (Graphics Interface, 1999)

Capturing and Re-Using Rendition Styles for Non-Photorealistic Rendering. - Jörg Hamel; Thomas Strothotte (Comput. Graph. Forum, 1999)

A new lighting model for computer-generated line drawings. - Jörg Hamel (2000)