@article{AL_1978_17_3_a5,
     author = {A. S. Markovichev},
     title = {Lower nil-radical of rings of type $(\gamma ,\,\delta )$},
     journal = {Algebra i logika},
     pages = {287--302},
     publisher = {mathdoc},
     volume = {17},
     number = {3},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1978_17_3_a5/}
}