@misc{RM_1984_39_4_a21,
     title = {Joint sessions {of~the~Petrovskii} {Seminar} and {the~Moscow} {Mathematical} {Society}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1984},
     volume = {39},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1984_39_4_a21/}
}