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@article{ARM_1982__18_4_a8, author = {Krbi\v{l}a, Jaroslav}, title = {{\CYRN}{\cyre}{\cyro}{\cyrb}{\cyrh}{\cyro}{\cyrd}{\cyri}{\cyrm}{\cyrery}{\cyre} {\cyri} {\cyrd}{\cyro}{\cyrs}{\cyrt}{\cyra}{\cyrt}{\cyro}{\cyrch}{\cyrn}{\cyrery}{\cyre} {\cyru}{\cyrs}{\cyrl}{\cyro}{\cyrv}{\cyri}{\cyrya} {\cyrn}{\cyre}{\cyrs}{\cyro}{\cyrp}{\cyrr}{\cyrya}{\cyrzh}{\cyre}{\cyrn}{\cyrn}{\cyro}{\cyrs}{\cyrt}{\cyri} {\cyrd}{\cyri}{\cyrf}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyro}{\cyrg}{\cyro} {\cyru}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrya} $y''=qy$}, journal = {Archivum mathematicum}, pages = {221--230}, publisher = {mathdoc}, volume = {18}, number = {4}, year = {1982}, mrnumber = {685808}, zbl = {0519.34026}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/ARM_1982__18_4_a8/} }
Krbiľa, Jaroslav. Необходимые и достаточные условия несопряженности дифференциального уравнения $y''=qy$. Archivum mathematicum, Tome 18 (1982) no. 4, pp. 221-230. http://geodesic.mathdoc.fr/item/ARM_1982__18_4_a8/