@article{AL_1967_6_4_a9,
     author = {Yu. M. Ryabukhin},
     title = {On the theory of the lower nil-radical of rings},
     journal = {Algebra i logika},
     pages = {83--92},
     publisher = {mathdoc},
     volume = {6},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1967_6_4_a9/}
}