@article{IM2_1968_2_5_a8,
     author = {I. B. Simonenko},
     title = {Some general questions in the theory of the {Riemann} boundary problem},
     journal = {Izvestiya. Mathematics },
     pages = {1091--1099},
     publisher = {mathdoc},
     volume = {2},
     number = {5},
     year = {1968},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1968_2_5_a8/}
}