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@article{DAN_1986_286_6_a4, author = {N. S. Nadirashvili}, title = {Multiplicity of eigenvalues of the {Neumann} problem}, journal = {Doklady Akademii Nauk}, pages = {1303--1305}, publisher = {mathdoc}, volume = {286}, number = {6}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1986_286_6_a4/} }
N. S. Nadirashvili. Multiplicity of eigenvalues of the Neumann problem. Doklady Akademii Nauk, Tome 286 (1986) no. 6, pp. 1303-1305. http://geodesic.mathdoc.fr/item/DAN_1986_286_6_a4/