1. Wang, P. K. C.,Optimal Control of Parabolic Systems with Boundary Conditions Involving Time Delays, SIAM Journal of Control and Optimization, Vol. 13, pp. 274?293, 1975.
2. Lions, J., andMagenes, E.,Nonhomogeneous Boundary-Value Problems and Applications, Vol. 1, Springer-Verlag, Heidelberg, Germany, 1972.
3. Lions, J., andMagenes, E.,Nonhomogeneous Boundary-Value Problems and Applications, Vol. 2, Springer-Verlag, Heidelberg, Germany, 1972.
4. Lions, J.,Optimal Control of Systems Governed by Partial Differential Equations, Springer-Verlag, Heidelberg, Germany, 1971.
5. Dunford, N., andSchwartz, J.,Linear Operators, Vol. 1, John Wiley and Sons (Interscience Publishers), New York, New York, 1958.