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@article{DAN_1964_157_5_a16, author = {A. G. Ramm}, title = {Conditions for the analyticity of the scattering matrix}, journal = {Doklady Akademii Nauk}, pages = {1073--1076}, publisher = {mathdoc}, volume = {157}, number = {5}, year = {1964}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1964_157_5_a16/} }
A. G. Ramm. Conditions for the analyticity of the scattering matrix. Doklady Akademii Nauk, Tome 157 (1964) no. 5, pp. 1073-1076. http://geodesic.mathdoc.fr/item/DAN_1964_157_5_a16/