@article{MAT_1968_12_4_a4,
     author = {G. Baumslag and B. H. Neumann and H. Neumann and P. M. Neumann},
     title = {On varieties generated by a finitely generated group},
     journal = {Matematika},
     pages = {50--79},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1968_12_4_a4/}
}