1. N. N., 2003, “UG Online Documentation,” UniGraphics Solution Inc., 10824 Hope Street, Cypress, CA 90630 (see http://www.ugsolutions.com).
2. N. N., 2002, “Catia V4 Online Documentation,” Dassault Systems, (see http://www.3ds.com).
3. Bazaraa, M. S., Sherali, H. D., and Shetty, C. M., 1992, Nonlinear Programming: Theory and Algorithms, Second Edition, John Wiley & Sons, New York.
4. N. N., 2002: “Sofy Online Documentation,” Sofy Technologies, 1111 W. Long Lake Road, Troy, MI (see http://www.sofy.com/).
5. Nagel, Roger N., Braithwaite, Walt W., and Kennicott, Philip R., 1980, “Initial Graphics Exchange Specification IGES,” Version 1.0, NBSIR 80-1978, National Bureau of Standards, Washington, DC. (see http://www.nist.gov/iges/).