References
- BHATKAR , V. P. , 1971 , Int. J. Engng Sci. 9 , 871 ; 1972, Ibid. 10, (in tho press) .
- EDELEN , D. G. B. , 1969a , Int. J. Engng Sci. , 7 , p269 p; 1969 b, Ibid., 7, 287; 1969 c, Ibid., 7, 373; 1969 d, Ibid., 7, 391; 1969 e, Ibid., 7, 401; 1969 f, Ibid., 1, 677; 1969 g, Ibid., 7, 843; 1970, Ibid., 8, 517 .