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@article{MAT_1957_1_2_a3, author = {E. Ch. Titchmarsh}, title = {Eigenfunction expansions associated with partial differential equations {(III)}}, journal = {Matematika}, pages = {61--78}, publisher = {mathdoc}, volume = {1}, number = {2}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1957_1_2_a3/} }
E. Ch. Titchmarsh. Eigenfunction expansions associated with partial differential equations (III). Matematika, Tome 1 (1957) no. 2, pp. 61-78. http://geodesic.mathdoc.fr/item/MAT_1957_1_2_a3/