REFERENCES
- ATHANS , M. , and TSE , E. , 1967 , I.E.E.E. Trans, autom. Control , 12 , 690 .
- BELLMAN , R. , KAGIWADA , H. , KALABA , R. , and SRIDHAK , R. , 1964 , RAND Research Memorandum , No. 4374-PR .
- BRYSON , A. E. , and FRAZIER , R. , 1963 , |CtProceedings of Optimum Systems Conference|Ct, Wright-Patterson Air Force Base , Ohio .
- Cox , H. , 1964 , I.E.E.E. Trans, autom. Control , 9 , 5 .
- DETCHMENDY , D. M. , and SRIDHAR , R. , 1966 , Trans. Am. Soc. mech. Engrs, J. bas. Engng , 88 , 362 .
- Ho, Y. C, and LEE , R. C. K. , 1964 , I.E.E.E. Trans, autom. Control , 9 , 333 .
- KAILATH , T. , 1968 , I.E.E.E. Trans, autom. Control , 13 , 646 .
- KAILATH , T. , and FROST , P. , 1968 , I.E.E.E. Trans, autom. Control , 13 , 655 .
- KALMAN , R. E. , 1960 , Trans. Am. Soc. mech. Engrs, J. bas. Engng , 82 , 35 .
- KALMAN , R. E. , and BUCY , R. S. , 1961 , Trans. Am. Soc. mech. Engrs, J. bas. Engng , 83 , 95 .
- KASHYAP , R. L. , 1963 , Technical Report 432, Cruft Laboratory , Harvard University , Cambridge , Mass .
- KUSHNER , H. J. , 1967 , J. diff. Equations , 3 , 179 .
- PEARSON , J. B. , 1967 , Automatika , 4 , 97 .
- STRATONOVICH , R. J. , 1960 . Theory of Probability and its Applications , 5 , 156 .
- WONHAM , W. M. , 1965 , J. SIAM Control , Series A , 2 , 347 .
- †Communicated by Professor S. S. Lamba.