1. Prasad, B. and Haftka, R.T., “Structural Optimization with Plate Finite Elements,” Journal of the Structural Division, ASCE, Vol. 105, No. ST11, pp. 2367–2382, 1979.
2. Braibant, V., Fleury, C. and Beckers, P., “Shape Optimal Design. An Approach Matching CAD and Optimization Concepts,” Report SAH09, Aerospace Laboratory of the University of Liege, Belgium, 1983.
3. Gill, P.E., Murray, W., Saunders, M.A. and Wright, M.H., “Computing Forwards-Difference Intervals for Numerical Optimization,” SIAM J. Sci. and Stat. Comput., Vol. No. 2, pp. 310–321, June 1983.
4. Iott, J., Haftka, R.T. and Adelman, H.M., “Selecting Step Sizes in Sensitivity Analysis by Finite Differences,” NASA TM 86382, 1985.
5. Camarda, C.J. and Adelman, H.M., “Static and Dynamic Structural-Sensitivity Derivative Calculation in the Finite-Element-Based Engineering Analysis Language (EAL) System,” NASA TM-85743, 1984.