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@article{AL_1977_16_4_a3, author = {V. M. Kopytov and N. Ya. Medvedev}, title = {Varieties of lattice-ordered groups}, journal = {Algebra i logika}, pages = {417--423}, publisher = {mathdoc}, volume = {16}, number = {4}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1977_16_4_a3/} }
V. M. Kopytov; N. Ya. Medvedev. Varieties of lattice-ordered groups. Algebra i logika, Tome 16 (1977) no. 4, pp. 417-423. http://geodesic.mathdoc.fr/item/AL_1977_16_4_a3/