@article{IVM_1991_3_a13,
     author = {Yu. M. Vazhenin and V. Yu. Popov},
     title = {Critical theories of free nilpotent rings of certain types},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {74--76},
     publisher = {mathdoc},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1991_3_a13/}
}