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@article{AL_1984_23_3_a7, author = {A. A. Shum}, title = {Varieties of algebraic systems and propositional calculi}, journal = {Algebra i logika}, pages = {341--359}, publisher = {mathdoc}, volume = {23}, number = {3}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1984_23_3_a7/} }
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/