@article{IVM_2004_7_a6,
     author = {N. B. Pleschinskii and D. N. Tumakov},
     title = {Boundary value problems for the {Helmholtz} equation in a quadrant and in a half-plane formed from two quadrants},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {63--74},
     publisher = {mathdoc},
     number = {7},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2004_7_a6/}
}