1. Isaacs, R.,Differential Games, John Wiley and Sons, New York, 1965.
2. Johnson, C. D.,Optimal Control with Chebychev Minimax Performance Index, Journal of Basic Engineering, Vol. 89, Series D, 1967.
3. Annals of Mathematical Studies;L. D. Berkovitz,1964
4. Berkovitz, L. D.,Necessary Conditions for Optimal Strategies in a Class of Differential Games and Control Problems, SIAM Journal on Control, Vol. 5, No. 1, 1967.
5. Leitmann, G.,Two-Person Zero-Sum Games: A Geometric Approach, Paper presented at the 36th National Meeting of the Operations Research Society of America, Miami, Florida, 1969.