1. A.K. Jain, “Fundamentals of Digital Image Processing”. Prentice-Hall, Englewood Cliffs, NJ, 1989
2. Chen Zhibin, Yu Yongquan, Chen eqing, Yang Shaomin, “Fuzzy Recognition of Graphite Morphology in Nodular Cast Iron Based on Evolution Strategy”, Proc. of the Fourth Intl. Conference on Machine Learning and Cybernetics, Guangzhou, Aug. 2005, pp 18-21
3. Handbook Committee, Handbook of ASM International, Vol 9, Metallography and Microstructures. ISBN:0-87170706-3
4. H. E. Henderson’s article titled “Ultrasonic Velocity Technique for Quality Assurance”, appearing in the Foundry Trade Journal,Feb. 21, 1974, at pages 203-208
5. Longin Jan Latecki and Rolf Lak¨amper and Ulrich Eckhardt, “Shape Descriptors for Nonrigid Shapes with a Single Closed Contour”, IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2000, pp 424-429