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@article{MS_1956__81_1_a2, author = {{\CYRB}.{\CYRM}. {\CYRL}{\cyre}{\cyrv}{\cyri}{\cyrt}{\cyra}{\cyrn}}, title = {{\CYRO} {\cyrd}{\cyri}{\cyrf}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyrr}{\cyro}{\cyrv}{\cyra}{\cyrn}{\cyri}{\cyri} {\cyrs}{\cyrp}{\cyre}{\cyrk}{\cyrt}{\cyrr}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyro}{\cyrishrt} {\cyrf}{\cyru}{\cyrn}{\cyrk}{\cyrc}{\cyri}{\cyri} {\cyro}{\cyrp}{\cyre}{\cyrr}{\cyra}{\cyrt}{\cyro}{\cyrr}{\cyra} {{\CYRL}{\cyra}{\cyrp}{\cyrl}{\cyra}{\cyrs}{\cyra}}}, journal = {Matemati\v{c}eskij sbornik}, pages = {37--50}, publisher = {mathdoc}, volume = {81}, number = {1}, year = {1956}, zbl = {0070.34701}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1956__81_1_a2/} }
Б.М. Левитан. О дифференцировании спектральной функции оператора Лапласа. Matematičeskij sbornik, Tome 81 (1956) no. 1, pp. 37-50. http://geodesic.mathdoc.fr/item/MS_1956__81_1_a2/