@article{SM_1989_63_2_a16,
     author = {I. M. Spitkovsky},
     title = {On a vectorial {Riemann} boundary value problem with infinite defect numbers, and related factorization of matrix-valued functions},
     journal = {Sbornik. Mathematics},
     pages = {521--538},
     publisher = {mathdoc},
     volume = {63},
     number = {2},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1989_63_2_a16/}
}