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@article{DAN_1960_132_5_a3, author = {G. V. Virabyan}, title = {The spectrum of a certain operator and {Dirichlet's} problem for the equation}, journal = {Doklady Akademii Nauk}, pages = {986--989}, publisher = {mathdoc}, volume = {132}, number = {5}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1960_132_5_a3/} }
G. V. Virabyan. The spectrum of a certain operator and Dirichlet's problem for the equation. Doklady Akademii Nauk, Tome 132 (1960) no. 5, pp. 986-989. http://geodesic.mathdoc.fr/item/DAN_1960_132_5_a3/