Labelled deductive systems. Vol. 1. (English)
Oxford Logic Guides. 33. Oxford: Clarendon Press. xiii, 497 p. \sterling 65.00 (1996).
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Linear lattice proof theory: an overview. (English)
Universal algebra and lattice theory, Proc. Conf., Charleston/S.C. 1984, Lect. Notes Math. 1149, 129-141 (1985).
2