@article{DE_1971_7_7_a8,
     author = {B. L. Kogan},
     title = {``Resonance'' representations of the solutions of a first order hyperbolic system in the plane},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1250--1262},
     publisher = {mathdoc},
     volume = {7},
     number = {7},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_7_a8/}
}