@article{DAN_1995_344_4_a5,
     author = {A. Ya. Helemskii},
     title = {Homological characterization of factors of {type~I}},
     journal = {Doklady Akademii Nauk},
     pages = {454--456},
     publisher = {mathdoc},
     volume = {344},
     number = {4},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1995_344_4_a5/}
}