@article{TVP_1984_29_2_a18,
     author = {E. R. Vvedenskaya},
     title = {On the existence of exact upper sequences},
     journal = {Teori\^a vero\^atnostej i ee primeneni\^a},
     pages = {385--387},
     year = {1984},
     volume = {29},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TVP_1984_29_2_a18/}
}