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@article{AL_1970_9_1_a4, author = {V. A. Roman'kov}, title = {Nondistributivity of the lattice of varieties of nilpotent groups}, journal = {Algebra i logika}, pages = {67--72}, publisher = {mathdoc}, volume = {9}, number = {1}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1970_9_1_a4/} }
V. A. Roman'kov. Nondistributivity of the lattice of varieties of nilpotent groups. Algebra i logika, Tome 9 (1970) no. 1, pp. 67-72. http://geodesic.mathdoc.fr/item/AL_1970_9_1_a4/