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@article{IM2_1968_2_1_a7, author = {A. V. Strauss}, title = {On the extensions and the characteristic function of a~symmetric operator}, journal = {Izvestiya. Mathematics }, pages = {181--203}, publisher = {mathdoc}, volume = {2}, number = {1}, year = {1968}, language = {en}, url = {http://geodesic.mathdoc.fr/item/IM2_1968_2_1_a7/} }
A. V. Strauss. On the extensions and the characteristic function of a~symmetric operator. Izvestiya. Mathematics , Tome 2 (1968) no. 1, pp. 181-203. http://geodesic.mathdoc.fr/item/IM2_1968_2_1_a7/