@article{FAA_1990_24_1_a2,
     author = {B. M. Levitan and L. B. Parnovskii},
     title = {On the asymptotic behavior of the discrete spectrum of the {Dirichlet} and {Neumann} problems for the {Laplace--Beltrami} operator on a regular polyhedron in the {Lobachevskii} space},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {21--28},
     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1990_24_1_a2/}
}