@article{DE_1979_15_4_a16,
     author = {A. F. Shestopal},
     title = {A spectral problem for the {Laplace} operator in domains of mirror-symmetric polyhedra},
     journal = {Differencialʹnye uravneni\^a},
     pages = {725--731},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_4_a16/}
}