@article{RM_2008_63_4_a0,
     author = {R. R. Gontsov and V. A. Poberezhnyi},
     title = {Various versions of the {Riemann--Hilbert} problem for linear differential equations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {603--639},
     publisher = {mathdoc},
     volume = {63},
     number = {4},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2008_63_4_a0/}
}