1. Borkar, V. S., A remark on the attainable distributions of controlled diffusions, Stochastics 18 (1986), 17?23.
2. Borkar, V. S., The probabilistic structure of controlled diffusion processes, Acta Appl. Math. 11 (1988), 19?48.
3. Borkar, V. S., Optimal Control of Diffusion Processes, Research Notes in Mathematics, No. 203, Longman, Harlow, 1989.
4. El Karoui, N., Huu Nguyen, D., Jeanblanc-Pique, M., Compactification methods in the control of degenerate diffusions: existence of an optimal control, Stochastics 20(3) (1987), 169?219.
5. Fleming, W. H., Generalized solutions in optimal stochastic control, in E. Roxin, P. T. Liu, and R. L. Sternberg (eds.), Differential Games and Control Theory III, Marcel Dekker, New York, 1977, pp. 147?165.