Geodesic
The Riemann problem. II
Differencialʹnye uravneniâ, Tome 12 (1976) no. 5, pp. 779-799 
N. P. Erugin. The Riemann problem. II. Differencialʹnye uravneniâ, Tome 12 (1976) no. 5, pp. 779-799. http://geodesic.mathdoc.fr/item/DE_1976_12_5_a0/
@article{DE_1976_12_5_a0,
     author = {N. P. Erugin},
     title = {The {Riemann} {problem.~II}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {779--799},
     year = {1976},
     volume = {12},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_5_a0/}
}
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