@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/}
}