1. Lincoln A. Wallen. Automated proof search in non-classical logics : efficient matrix proof methods for modal and intuitionistic logics, MIT Press series in artificial intelligence.. Cambridge, Mass., : M.I.T. Press, 1990.
   Keywords: modal logic, proof theory, model theory, honours reading. [abstract] [bibtex-entry]



2. Lincoln A. Wallen. Automated Deduction in Nonclassical Logics: efficient matrix proof methods for modal and intuionistic logics. The MIT Press, 1989.
   Keywords: modal logic, proof theory, model theory, honours reading. [abstract] [bibtex-entry]

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