@article{DAN_1985_280_4_a2,
     author = {V. B. Dybin},
     title = {Correct formulation of the {Riemann} problem in the case of an},
     journal = {Doklady Akademii Nauk},
     pages = {785--788},
     publisher = {mathdoc},
     volume = {280},
     number = {4},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_280_4_a2/}
}