References
- Abramowitz , M. and Stegun , I. A. 1972 . Handbook of Mathematical Functions , 573 New York : Dover .
- Barkham , P. G. D. , and Soudack , A. C 1969 , Int. J. Control , 10 , 372 ; 1970, Ibid., 11, 101 .
- Bravo Yuste , S. and Díaz Bejarano , J. 1987 . J. Sound Vibrat. , 114 : 33
- Christopher , P. A. T. 1973 . Int. J. Control , 17 : 597
- Christopher , P. A. T. and Brocklehurst , A. 1974 . Int. J. Control , 19 : 831
- Erdélyi , A. 1981 . Higher Transcendental Functions , Vol. II , 319 Malabar, Fla : R. E. Krieger .
- Soudack , A. C . 1974 . Int. J. Control , 19 : 841
- Soudack , A. C , and Barkham , P. G. D. 1970 , Int. J. Control , 12 , 763 ; 1971, Ibid., 13, 767 .