1. Wilde, D. J., andBeightler, C. S.,Foundations of Optimization, Prentice-Hall, Englewood Cliffs, New Jersey, 1967.
2. Zangwill, W. I.,Nonlinear Programming: A Unified Approach, Prentice-Hall, Englewood Cliffs, New Jersey, 1969.
3. Luenberger, D. G.,Optimization by Vector Space Methods, John Wiley and Sons, New York, New York, 1969.
4. Dorfman, R.,An Economic Interpretation of Optimal Control Theory, American Economic Review, Vol. 59, pp. 817?831, 1969.
5. Lee, E. B., andMarkus, L.,Foundations of Optimal Control Theory, John Wiley and Sons, New York, New York, 1968.