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@article{GMJ_1995__2_3_47277, author = {Jaiani, G.}, title = {On a generalization of the {Keldysh} theorem.}, journal = {Georgian Mathematical Journal}, pages = {291--297}, publisher = {mathdoc}, volume = {2}, number = {3}, year = {1995}, zbl = {0824.35039}, language = {en}, url = {http://geodesic.mathdoc.fr/item/GMJ_1995__2_3_47277/} }
Jaiani, G. On a generalization of the Keldysh theorem.. Georgian Mathematical Journal, Tome 2 (1995) no. 3, pp. 291-297. http://geodesic.mathdoc.fr/item/GMJ_1995__2_3_47277/