Geodesic
The nonlinear Riemann–Hilbert problem
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Differential equations with real and complex time, Tome 213 (1997), pp. 10-34 
Yu. S. Ilyashenko. The nonlinear Riemann–Hilbert problem. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Differential equations with real and complex time, Tome 213 (1997), pp. 10-34. http://geodesic.mathdoc.fr/item/TM_1997_213_a1/
@article{TM_1997_213_a1,
     author = {Yu. S. Ilyashenko},
     title = {The nonlinear {Riemann{\textendash}Hilbert} problem},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {10--34},
     year = {1997},
     volume = {213},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1997_213_a1/}
}
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