REFERENCES
- DASARATHY , B. V. , and SRINIVASAN , P. , 1968a , J.Sound Vibr. , 7 , 29 ; 1968 b, A. I.A. A. Jl (to be published) .
- MURPHY , G. M. , 1960 , Ordinary Differential Equations and their Solutions ( New York : D. van Nostrand Co. Inc. ), p. 166 .
- †Communication by the Authors.