@article{DE_1989_25_6_a19,
     author = {E. E. Barbashina},
     title = {Necessary conditions of {Copa{\textendash}Moir} type for a {Goursat{\textendash}Darboux} system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1045--1047},
     year = {1989},
     volume = {25},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_6_a19/}
}