1. Ciarlet, P.,The Finite Element Method for Elliptic Problems, North-Holland Publishing Company, New York, New York, 1978.
2. Lions, J. L.,Control of Systems Governed by Partial Differential Equations, Springer-Verlag, New York, New York, 1972.
3. Kunisch, K., andWhite, L.,Regularity Properties in Elliptic Equations, Applicable Analysis, Vol. 21, pp. 71?88, 1986.
4. White, L. W.,Estimation of Higher-Order Damping Terms in Linear Plate Models, Applications in Mathematics and Computers, Vol. 33, pp. 89?122, 1989.
5. Luenberger, D. G.,Optimization by Vector Space Methods, Wiley, New York, New York, 1968.