@article{SMZ_2006__47_1_53171,
     author = {Zenkov, A.V.},
     title = {Covers in the lattice of varieties of -groups.},
     journal = {Sibirskij Matematicheskij Zhurnal},
     pages = {73},
     publisher = {mathdoc},
     volume = {47},
     number = {1},
     year = {2006},
     zbl = {1115.06009},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/SMZ_2006__47_1_53171/}
}