Geodesic
A second-order equation of hyperbolic type with two singular lines
Differencialʹnye uravneniâ, Tome 24 (1988) no. 12, pp. 2129-2133 
N. Radjabov. A second-order equation of hyperbolic type with two singular lines. Differencialʹnye uravneniâ, Tome 24 (1988) no. 12, pp. 2129-2133. http://geodesic.mathdoc.fr/item/DE_1988_24_12_a16/
@article{DE_1988_24_12_a16,
     author = {N. Radjabov},
     title = {A second-order equation of hyperbolic type with two singular lines},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2129--2133},
     year = {1988},
     volume = {24},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_12_a16/}
}
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