@misc{RM_1981_36_3_a24,
     title = {Sessions of the {Petrovskii} {Seminar} on differential equations and mathematical problems of physics},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1981},
     volume = {36},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1981_36_3_a24/}
}