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@article{AL_1970_9_6_a5, author = {B. I. Zil'ber}, title = {Isomorphism and elementary equivalence of commutative semigroups}, journal = {Algebra i logika}, pages = {667--671}, publisher = {mathdoc}, volume = {9}, number = {6}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1970_9_6_a5/} }
B. I. Zil'ber. Isomorphism and elementary equivalence of commutative semigroups. Algebra i logika, Tome 9 (1970) no. 6, pp. 667-671. http://geodesic.mathdoc.fr/item/AL_1970_9_6_a5/