@article {Lu:2003:TVCG, author = "Lu, A. and Morris, C. and Taylor, J. and Ebert, D. and Rheingans, P.and Hansen, C. and Hartner, M.", title = "Illustrative Interactive Stipple Rendering", journal = "IEEE Tracsactions on Visualization Computer Graphics", volume = "Vol.9", number = "No.2", pages = "127--139", year = "2003", }