REFERENCES
- BANAS , J. F. , and VACROUX , A. G. , 1969 , Proc. Fourth I.F.A.C. Congress , Session 13 , p. 41 , Warsaw , Poland .
- BECKEB , S. T. , and LOPRESII , P. V. , 1968 , Proc. Sixth AUerton Conf. , p. 456 ,
- JORDAN , B. W. , and POLAK , E. , 1965 , J. SIAM Control , 2 , 332 .
- KIRK , D. E. , 1967 , I.E.E.E.Trans.Aulom.Control , 12 , 307 .
- NAKDIZZI , L. B. , and BEKEY , G. A. , 1968 , Int.J.Control , 8 , 571 .
- PONTRYAGIN , L. S. , BOLTYANSKII , V. G. GAMKHELIDZE , R. V. and MISHCHENKO , E. F. , 1962 , The Mathematical Theory of Optimal Processes ( New York Wiley ).
- †Communicated by Professor Vacroux.