@article{DE_1989_25_11_a19,
     author = {V. A. Malovichko},
     title = {Boundary value problems for degenerate and nondegenerate hyperbolic systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1977--1981},
     year = {1989},
     volume = {25},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_11_a19/}
}