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@article{ARM_1966__2_2_a1, author = {Neuman, Franti\v{s}ek}, title = {Note on the second phase of the differential equation $y''=q(t)y$}, journal = {Archivum mathematicum}, pages = {57--62}, publisher = {mathdoc}, volume = {02}, number = {2}, year = {1966}, mrnumber = {0203127}, zbl = {0217.40201}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1966__2_2_a1/} }
Neuman, František. Note on the second phase of the differential equation $y''=q(t)y$. Archivum mathematicum, Tome 02 (1966) no. 2, pp. 57-62. http://geodesic.mathdoc.fr/item/ARM_1966__2_2_a1/