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@article{AL_1984_23_6_a6, author = {L. A. Shemetkov}, title = {The product of formations of algebraic systems}, journal = {Algebra i logika}, pages = {721--729}, publisher = {mathdoc}, volume = {23}, number = {6}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1984_23_6_a6/} }
L. A. Shemetkov. The product of formations of algebraic systems. Algebra i logika, Tome 23 (1984) no. 6, pp. 721-729. http://geodesic.mathdoc.fr/item/AL_1984_23_6_a6/