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2. Maple 6.0, Advancing Mathematics. See http://www.maplesoft.com.
3. MATHEMATICA 4.1, The Way the World Calculates. See http://www.wolfram.com/.
4. Matlab 6: Increasing The Scope and Productivity of Engineering Science. See http://www.mathworks.com/.
5. A numerical methods for engineers with programming and software applications, WCB McGraw Hill, New York, 1996.