@article{DE_1983_19_1_a23,
     author = {D. I. Gegia},
     title = {Characteristic problem for the {Monge--Amp\`ere} equation of hyperbolic type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {166--169},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_1_a23/}
}