REFERENCES
- LEE , E. B. , and MARCUS , L. , 1967 , Foundations of Optimal Control Theory ( New York John Wiley ).
- PONTRYAGIN , L. S. , BOLTYANSKII , V. G. , GAMKRELIDZE , R. V. ,MISHCHENKO. E. F., 1962 , The Mathematical Theory of Optimal Processes ( New York Interscience, John Wiley ).
- † Communicated by Dr. A. T. Fuller.