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@article{AL_1983_22_1_a3, author = {N. Ya. Medvedev}, title = {Coverings in a lattice of $l$-varieties}, journal = {Algebra i logika}, pages = {53--60}, publisher = {mathdoc}, volume = {22}, number = {1}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1983_22_1_a3/} }
N. Ya. Medvedev. Coverings in a lattice of $l$-varieties. Algebra i logika, Tome 22 (1983) no. 1, pp. 53-60. http://geodesic.mathdoc.fr/item/AL_1983_22_1_a3/