Geodesic
The Riemann–Hilbert problem for the region exterior to a set of cuts along a line or a circle
Doklady Akademii Nauk, Tome 156 (1964) no. 2, pp. 275-277 
G. P. Cherepanov. The Riemann–Hilbert problem for the region exterior to a set of cuts along a line or a circle. Doklady Akademii Nauk, Tome 156 (1964) no. 2, pp. 275-277. http://geodesic.mathdoc.fr/item/DAN_1964_156_2_a10/
@article{DAN_1964_156_2_a10,
     author = {G. P. Cherepanov},
     title = {The {Riemann{\textendash}Hilbert} problem for the region exterior to a set of cuts along a line or a circle},
     journal = {Doklady Akademii Nauk},
     pages = {275--277},
     year = {1964},
     volume = {156},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_156_2_a10/}
}
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