@article{107148, author = {Jaroslav Krbi\v la}, title = {Neobkhodimye i dostatochnye usloviia nesopriazhennosti differentsial'nogo uravneniia $y''=qy$}, journal = {Archivum Mathematicum}, volume = {018}, year = {1982}, pages = {221-230}, zbl = {0519.34026}, mrnumber = {685808}, language = {ru}, url = {http://dml.mathdoc.fr/item/107148} }
Krbiľa, Jaroslav. Необходимые и достаточные условия несопряженности дифференциального уравнения $y''=qy$. Archivum Mathematicum, Tome 018 (1982) pp. 221-230. http://gdmltest.u-ga.fr/item/107148/
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