@article{SM_1983_45_2_a3,
     author = {G. S. Litvinchuk and I. M. Spitkovsky},
     title = {Sharp estimates of defect numbers of a generalized {Riemann} boundary value problem, factorization of hermitian matrix-valued functions and some problems of approximation by meromorphic functions},
     journal = {Sbornik. Mathematics},
     pages = {205--224},
     publisher = {mathdoc},
     volume = {45},
     number = {2},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1983_45_2_a3/}
}