@article{DE_1992_28_1_a10,
     author = {E. A. Larionov},
     title = {Differential equations of hyperbolic type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {91--96},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_1_a10/}
}