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[25] H.J. Sussmann, Catastrophe theory - a preliminary critical study, PSA 1976 vol. 1 (eds. F. Suppe & P.D. Asquith), Phil. Sci. Assoc., East Lansing, Michigan 1976.

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[31] R.S. Zahler & H.J. Sussmann, Claims and accomplishments of applied catastrophe theory, Nature 269 (1977), 759-763. Letters pointing out many errors, misquotations etc. are in ibid. 270 (1977), 381-384, 658, and a reply by Zahler with some new ones in 271 (1978), 401.

[32] E.C. Zeeman, Differential equations for the heartbeat and nervous impulse, in Towards a Theoretical Biology IV (ed. C.H. Waddington), Edinburgh Univ. Press, 1972, 8-67, Dynamical Systems (ed. M.M. Peixoto), Academic Press, N.Y. 1973, and [35] 81-140. | MR

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[36] E.C. Zeeman, A boundary value problem involving cusps, to appear.

See also I.N. Stewart and T. Poston, The Catastrophe Theory Controversy, to appear in the New Scientist, and the September 1978 special 'Catastrophe Theory' issue of Behavioral Science, where further arguments for catastrophe modelling are variously developed.