@article{DE_1991_27_1_a1,
     author = {V. F. Apel'tsin},
     title = {Analytic continuations of solutions of boundary value problems for the stationary wave equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {8--17},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_1_a1/}
}