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Hennessy, Matthew (1988) Algebraic theory of processes. The Foundations Of Computing Series . MIT Press. ISBN 0262081717

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Weir, David and Joshi, Aravind (1988) Combinatory categorial grammars: generative power and relationship to linear context-free rewriting systems. In: Proceedings of the 26th Meeting of the Association for Computational Linguistics. Association for Computational Linguistics, Stanford, California, pp. 278-285.

Whitby, Blay (1988) Artificial intelligence: a handbook of professionalism. Ellis Horwood Series in Mechanical Engineering . Ellis Horwood, Chichester, West Sussex. ISBN 0470211032