Creating non-photorealistic images the designer's way. - Nick Halper; Stefan Schlechtweg; Thomas Strothotte (NPAR, 2002)

Stylizing Silhouettes at Interactive Rates: From Silhouette Edges to Silhouette Strokes. - Tobias Isenberg 001; Nick Halper; Thomas Strothotte (Comput. Graph. Forum, 2002)

Psychology and Non-Photorealistic Rendering: The Beginning of a Beautiful Relationship. - Nick Halper; Mara Mellin; Christoph S. Herrmann; Volker Linneweber; Thomas Strothotte (MuC, 2003)

OPENNPAR: A System for Developing, Programming, and Designing Non-Photorealistic Animation and Rendering. - Nick Halper; Tobias Isenberg 001; Felix Ritter; Bert Freudenberg; Oscar Meruvia; Stefan Schlechtweg; Thomas Strothotte (PG, 2003)

A Developer's Guide to Silhouette Algorithms for Polygonal Models. - Tobias Isenberg 001; Bert Freudenberg; Nick Halper; Stefan Schlechtweg; Thomas Strothotte (IEEE Computer Graphics and Applications, 2003)

Rendering and Affect. - David J. Duke; Philip J. Barnard; Nick Halper; Mara Mellin (Comput. Graph. Forum, 2003)