1. , Applied Dynamic Programming, Princeton University Press, Princeton, N. J. 1962.
2. Discrete Dynamic Programming, Blaisdell, New York 1964.
3. , Optimization of Chemical Processes, McGraw-Hill, New York 1988, p. 401.
4. , Optimal Control of Engineering Processes, Blaisdell, Waltham, MA 1967.
5. Correspondence. Discrete Maximum Principle