@article{DE_1996_32_9_a6,
     author = {P. A. Krutitskii},
     title = {A mixed problem for the {Helmholtz} equation outside cuts on the plane},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1202--1211},
     publisher = {mathdoc},
     volume = {32},
     number = {9},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1996_32_9_a6/}
}