.
[1] [2] 
Lines and How to Draw Them
Stefan Schlechtweg.
Norsk samarbeid innen grafisk databehandling, No. 2/97, pp. 4--6,
1997. [BibTeX]
Non-Photorealistic Computer Graphics: Modeling, Rendering and Animation
Thomas Strothotte, Stefan Schlechtweg.
Morgan Kaufmann, Hardcover, 1, June 15,
2002. [BibTeX]
OPENNPAR: A System for Developing, Programming, and Designing Non-Photorealistic Animation and Rendering
Nick Halper, Tobias Isenberg, Felix Ritter, Bert Freudenberg, Oscar E. Meruvia Pastor, Stefan Schlechtweg, Thomas Strothotte.
11th Pacific Conference on Computer Graphics and Applications (PG'03), pp. 424, Canmore, Canada,
2003. [BibTeX]
RenderBots-Multi-Agent Systems for Direct Image Generation
Stefan Schlechtweg, Tobias Germer, Thomas Strothotte.
Computer Graphics Forum, Vol. 24, No. 2, pp. 137--148, June,
2005. [BibTeX]
Rendering Line Drawings with Limited Resources
Author(s): Stefan Schlechtweg, Thomas Strothotte.
Proceedings: Proceedings of GraphiCon'96, Vol. 2, pp. 131--137, St. Petersburg, Russia, July,
1996.
[BibTeX] 
Abstract:
Pictures play an important role in the communication process. Communicative goals can be expressed for instance with the specific use of different levels of abstraction in pictures. Especially in textbooks and scientific publications, images are used where the level of detail of different objects is deliberately changed to express the importance of an object in the picture. In this paper we introduce the concept of "drawing resources" for rendered line-drawings. This concept defines measures for controlling the level of detail of single objects in a drawing. We present a system which is based on a line-renderer and which enables a user to interact with the drawing thus created. The concept of drawing resources yields a new basis for formulating the user's ideas of the appearance of the final image.
Speedlines - Depicting Motion in Motionless Pictures
Maic Masuch, Stefan Schlechtweg.
Siggraph 1999, 8-13 August 1999, Los Angeles,
1999. [BibTeX]
Surfaces To Lines: Rendering Rich Line Drawings
Stefan Schlechtweg, Bert Schönwälder, Lars Schumann, Thomas Strothotte.
The Sixth International Conference in Central Europe on Computer Graphics and Visualization'98 (WSCG'98), University of West Bohemia, Campus Bory, Plzen - Bory, Czech Republic, February 9-13,
1998. [BibTeX]
Teaching Non-Photorealistic Animation and Rendering
Thomas Strothotte, Stefan Schlechtweg.
1st International Symposium on Non-Photorealistic Animation and Rendering (NPAR'00), pp. 109, Annecy, France, June 05 - 07,
2000. [BibTeX]