Geodesic
The Riemann problem. I
Differencialʹnye uravneniâ, Tome 11 (1975) no. 5, pp. 771-781 
N. P. Erugin. The Riemann problem. I. Differencialʹnye uravneniâ, Tome 11 (1975) no. 5, pp. 771-781. http://geodesic.mathdoc.fr/item/DE_1975_11_5_a0/
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     author = {N. P. Erugin},
     title = {The {Riemann} {problem.~I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {771--781},
     year = {1975},
     volume = {11},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_5_a0/}
}
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