@article{DE_1972_8_6_a23,
     author = {N. M. Matveev},
     title = {A certain generalization of the {Cauchy} problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1124--1125},
     publisher = {mathdoc},
     volume = {8},
     number = {6},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_6_a23/}
}