R. Raju, D. Dhivya, R. Saranya, und S. Abbinaya. International Journal of Innovative Science and Modern Engineering (IJISME), 1 (3):
72-75(Februar 2013)
R. Curry, und M. Heywood. Proceedings of the IEEE International Conference on
Systems, Man, and Cybernetics, Seite 1938--1945. Montreal, IEEE Press, (7-10 October 2007)