[1] [2] 
Rendering Parametric Surfaces in Pen and Ink
George Winkenbach, David H. Salesin.
SIGGRAPH 96,
1996. [BibTeX]
Reproducing color images as duotones
Joanna L. Power, Brad S. West, Eric J. Stollnitz, David H. Salesin.
Proceedings of the 23rd Annual Conference on Computer Graphics and Interactive Techniques (SIGGRAPH'96), pp. 237--248, ACM Press,
1996. [BibTeX]
Scale-dependent reproduction of pen-and-ink illustrations
Michael P. Salisbury, Corin Anderson, Dani Lischinski, David H. Salesin.
Proceedings of the 23rd annual conference on Computer graphics and interactive techniques, pp. 461--468,
1996. [BibTeX]
SKETCH: An Interface for Sketching 3D Scenes
Robert C. Zeleznik, Kenneth P. Herndon, John F. Hughes.
Proceedings of SIGGRAPH '96, August,
1996. [BibTeX]
Special Effects with Half-Toning
John W. Buchanan.
Computer Graphics Forum, Vol. 15, No. 3, pp. 97--108,
1996. [BibTeX]
The Painterly Approach
Author(s): Wasinee Rungsarityotin, Victor Zordan.
Misc: Georgia Tech. - (Project: Advanced Topics in Rendering),
1996.
[BibTeX] 
Abstract:
In siggraph 96, "Painterly Rendering for Animation" introduced an exciting approach for rendering images that appeared to be hand painted. The approach applied brush strokes in screen space to projected particles representing the scene geometry surfaces. By using the projected particles, frame to frame consistency for animation was supported. Orientation information for the scene geometry dictated the direction of the strokes in screen space. The shapes of the brush strokes could be used to change the style of the final image.
This report summarizes our decisions, the algorithm we implemented and how it differs from the painterly approach, followed by conclusions and future work. A detailed description of the original algorithm is described in the paper [ref 1].