References
1.Stanford University, Procedural Butterflies, [Online] Available: http://www.cs.ubc.ca/nest/imager/contributions/bobl/imagergallery/main/top.html, [February 2003]
2.Wen-Kai Dai, Ruei-Chuan Chang, and Zen-Chung Shih Fractal pattern for a butterfly wing. The Visual Computer, Springer-Verlag :1995
3.Adrian Porter, Newton's Method, Thomas Jefferson High School for Science and Technology [Online] Available: http://www.tjhsst.edu/~dhyatt/superap/web/aporter/scpics8.html