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@article{MMO_1958_7_a6, author = {B. M. Levitan}, title = {Differentiation of an expansion in eigenfunctions of the {Schr\"odinger} equation}, journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva}, pages = {269--290}, publisher = {mathdoc}, volume = {7}, year = {1958}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MMO_1958_7_a6/} }
B. M. Levitan. Differentiation of an expansion in eigenfunctions of the Schr\"odinger equation. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 7 (1958), pp. 269-290. http://geodesic.mathdoc.fr/item/MMO_1958_7_a6/