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2. E. Mendelson, Introduction to Mathematical Logic, Van Nostrand, Princeton, 1975.
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4. A. Chubaryan and A. Khamisyan, “Generalization of Kalmar’s proof of deducibility in two valued propositional logic into many valued logic”, Pure and Applied Mathematics Journal, doi: 10.116448/j.pamj. 20170602.12, vol. 6, no. 2, pp. 71-75, 2017.
5. A. Chubaryan, A. Khamisyan and A. Tshitoyan, “On some systems for Łukasiewicz’s many-valued logic and its properties”,FundamentalisScientiam, vol. 8, no. 8, Spain, pp. 74-79, 2017.