@article{DAN_1980_255_5_a3,
     author = {G. S. Litvinchuk and I. M. Spitkovsky},
     title = {Sharp estimates of the defect numbers of the generalized {Riemann} boundary value problem},
     journal = {Doklady Akademii Nauk},
     pages = {1042--1046},
     publisher = {mathdoc},
     volume = {255},
     number = {5},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_255_5_a3/}
}