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2. ‘Organisms as Causal Systems Which Are Not Mechanisms: An Essay into the Nature of Complexity’, in ‘Theoretical Biology and Complexity: Three Essays on the Natural Philosophy of Complex Systems’, Academic Press, London, 1985, pp. 165–203.
3. ‘Anticipatory Systems’, Pergamon Press, New York, 1985.
4. ‘Bionics Revisited’, in ‘The Machine as Metaphor and Tool’, Springer-Verlag, Berlin, 1993, pp. 87–100.