Varieties of algebraic systems and propositional calculi
Algebra i logika, Tome 23 (1984) no. 3, pp. 341-359.

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     author = {A. A. Shum},
     title = {Varieties of algebraic systems and propositional calculi},
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     year = {1984},
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     url = {http://geodesic.mathdoc.fr/item/AL_1984_23_3_a7/}
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A. A. Shum. Varieties of algebraic systems and propositional calculi. Algebra i logika, Tome 23 (1984) no. 3, pp. 341-359. http://geodesic.mathdoc.fr/item/AL_1984_23_3_a7/