@article{DE_1965_1_2_a13,
     author = {V. V. Bobkov and V. I. Krylov},
     title = {The method of integral relations for equations and systems of hyperbolic type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {230--243},
     publisher = {mathdoc},
     volume = {1},
     number = {2},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_2_a13/}
}