@article{DE_2006_42_5_a7,
     author = {A. A. Polosin},
     title = {On the location of the spectrum of a mixed boundary value problem for the {Laplace} equation in a half-disk},
     journal = {Differencialʹnye uravneni\^a},
     pages = {641--652},
     publisher = {mathdoc},
     volume = {42},
     number = {5},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_5_a7/}
}