OpenGL Shading Language
Randi J. Rost, Bill Licea-Kane.
Chapter 18 - Non-photorealistic Shaders, pp. 507--532, Addison-Wesley, 3rd,
2009. [BibTeX]
Painterly renderings using a synthesis of styles based on visual perception
Takashi Yoneyama, Etsuo Genda, Kunio Kondo.
Proceedings of the 8th International Conference on Virtual Reality Continuum and its Applications in Industry (VRCAI'09), pp. 59--64, ACM,
2009. [BibTeX]
Painting with polygons: non-photorealistic rendering using existing tools
Isaac Botkin.
Siggraph Talk, August,
2009. [BibTeX]
Perspective-aware cartoon clips synthesis
Yueting Zhuang, Jun Yu, Jun Xiao, Cheng Chen.
Computer Animation and Virtual Worlds, Vol. 19, No. 3-4, pp. 355--364,
2009. [BibTeX]
Ray Tracing NPR-Style Feature Lines
Author(s): A.N.M. Imroz Choudhury, Steven G. Parker.
Proceedings: NPAR '09: Proceedings of the 7th International Symposium on Non-Photorealistic Animation and Rendering, pp. 5--14, ACM,
2009.
[BibTeX] [DOI] 
Abstract:
We present an algorithm for rendering high-quality line primitives of controllable on-screen width within a ray tracing framework, which can render simple NPR-style feature lines, including silhouette edges, crease lines, and primitive intersection lines. The algorithm is based on a variant of cone tracing, which measures distances in screen space and is used to detect and render feature lines. This technique opens ray tracing up to previously difficult or impossible styles of rendering, such as mesh visualization, as well as a variety of NPR techniques, such as apparent ridges.
Resolution Independent NPR-Style 3D Line Textures
Kristin Potter, Amy A. Gooch, Bruce Gooch, Peter Willemsen, Joe Kniss, Richard Riesenfeld, Peter Shirley.
Computer Graphics Forum, Vol. 28, No. 1, pp. 56--66,
2009. [BibTeX]
Skin-Aware Stylization of Video Portraits
Deirdre O'Regan, A.C. Kokaram.
Conference for Visual Media Production (CVMP '09), pp. 35--44,
2009. [BibTeX]
Vectorizing Cartoon Animations
Song-Hai Zhang, Tao Chen, Yi-Fei Zhang, Shi-Min Hu, Ralph R. Martin.
IEEE Transactions on Visualization and Computer Graphics, Vol. 15, No. 4, pp. 618--629,
2009. [BibTeX]