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@article{MS_1964__105_3_a6, author = {{\CYRM}.{\CYRG}. {\CYRG}{\cyra}{\cyrs}{\cyrery}{\cyrm}{\cyro}{\cyrv} and {\CYRB}.{\CYRM}. {\CYRL}{\cyre}{\cyrv}{\cyri}{\cyrt}{\cyra}{\cyrn}}, title = {{\CYRO} {\cyrd}{\cyri}{\cyrf}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyrh} {\cyro}{\cyrp}{\cyre}{\cyrr}{\cyra}{\cyrt}{\cyro}{\cyrr}{\cyra}{\cyrh} {{\CYRSH}{\cyrt}{\cyru}{\cyrr}{\cyrm}{\cyra}-{\CYRL}{\cyri}{\cyru}{\cyrv}{\cyri}{\cyrl}{\cyrl}{\cyrya}} {\cyrs} {\cyrd}{\cyri}{\cyrs}{\cyrk}{\cyrr}{\cyre}{\cyrt}{\cyrn}{\cyrery}{\cyrm} {\cyrs}{\cyrp}{\cyre}{\cyrk}{\cyrt}{\cyrr}{\cyro}{\cyrm}}, journal = {Matemati\v{c}eskij sbornik}, pages = {445--458}, publisher = {mathdoc}, volume = {105}, number = {3}, year = {1964}, zbl = {0126.10303}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1964__105_3_a6/} }
М.Г. Гасымов; Б.М. Левитан. О дифференциальных операторах Штурма-Лиувилля с дискретным спектром. Matematičeskij sbornik, Tome 105 (1964) no. 3, pp. 445-458. http://geodesic.mathdoc.fr/item/MS_1964__105_3_a6/