REFERENCES
- DASARATHY , B. V. , and SRINIVASAN , P. , 1967a , Jl R. aeronaut. Soc. , 71 , 439 ; 1967b, Indian Engng, 11,1; 1967c, Int. J. Control, 6,337; 1968, J. Sound Vibration, 7,29
- MURPHY , G. M. , 1960 , Ordinary Differential Equations and their Solutions ( New York : D. Van Nostrand Co. Inc. )
- †Communicated by the Authors.