@article{VMUMM_1991_2_a3,
     author = {A. S. Ogryzkov},
     title = {On certain generalization of normality},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {17--20},
     publisher = {mathdoc},
     number = {2},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_2_a3/}
}