REFERENCES
- CROSSLEY , T. R. , 1970 , University of Salford , Report USME/DC/112/70 .
- CROSSLEY , T. R. , and PORTER , B. , 1968 , Aeronaut. J. , 72 , 697 ; 1969, Ibid., 73, 138 .
- PORTER , B. , 1969 , Synthesis of Dynamical Systems ( London Nelson ), p. 34 .
- † Communicated by Professor B. Porter.