1. R. McN. ALEXANDER,J. Exp. Biol. 41 (1964) 363.
2. R. E. COHEN, C. J. HOOLEY and N. G. McCRUM,J. Biomech. 9 (1976) 175.
3. K. L. DORRINGTON, in Symposium of the Society of Experimental Biology No. 34, Leeds University, September, 1979, edited by J. F. V. Vincent and J. D. Currey (Cambridge University Press, Cambridge, 1980) p. 289.
4. J. L. KATZ,ibid., p. 137.
5. R. H. PAIN,ibid., p. 359.