@article{DE_1967_3_6_a11,
     author = {S. P. Khairullina},
     title = {Solution of a completely hyperbolic equation with initial data given on a line of degeneracy},
     journal = {Differencialʹnye uravneni\^a},
     pages = {994--1001},
     publisher = {mathdoc},
     volume = {3},
     number = {6},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_6_a11/}
}