1. Fattorini, H.O.: Infinite Dimensional Optimization and Control Theory. Encyclopedia of Mathematics and its Applications. Cambridge University Press, Cambridge (1999)
2. Ahmed, N.U., Teo, K.L.: Optimal Control of Distributed Parameter Systems. North Holland, New York (1981)
3. Ahmed, N.U.: Semigroup Theory with Application to Systems and Control, Pitman Research Notes in Mathematics Series, 246. U.K., Co-published with Wiely, New York, Longman Scientific and Technical (1991)
4. Ahmed, N.U.: Optimal relaxed controls for systems governed by impulsive differential inclusions. Nonlinear Funct. Anal. Appl. 10(3), 427–460 (2005)
5. Ahmed, N.U.: Optimal control of
$$\infty $$
-Dimensional stochastic systems via generalized solutions of HJB equations. Discussiones Mathematicae Diff. Incl. Control Optim. 21, 97–126 (2001)