@article{DE_1998_34_5_a7,
     author = {N. Yu. Kapustin and E. I. Moiseev},
     title = {A spectral problem for the {Laplace} operator in the square with a spectral parameter in the boundary condition},
     journal = {Differencialʹnye uravneni\^a},
     pages = {662--667},
     publisher = {mathdoc},
     volume = {34},
     number = {5},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_5_a7/}
}