@misc{RM_1991_46_6_a3,
     title = {International {Conference} on {Differential} {Equations} and {Related} {Questions} {In} honour of the 90th anniversary of the birth of {Academician} {I.\,G.~Petrovskii} (1901--1973), {Rector} of {Moscow} {State} {University} from 1951 to 1973 (14th~joint session of the {Petrovskii} {Seminar} and the {Moscow} {Mathematical} {Society,} 29 {May--3} {June~1991)}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {149--215},
     publisher = {mathdoc},
     volume = {46},
     number = {6},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1991_46_6_a3/}
}