@misc{RM_1979_34_5_a15,
     title = {Sessions of the {Petrovskii} {Seminar} on differential equations and mathematical problems of physics},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {34},
     number = {5},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1979_34_5_a15/}
}