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@article{ARM_1966__2_3_a1, author = {Vosmansk\'y, Jarom{\'\i}r}, title = {The monotonicity of extremants of integrals of the differential equation $y''+q(t)y=0$}, journal = {Archivum mathematicum}, pages = {105--111}, publisher = {mathdoc}, volume = {02}, number = {3}, year = {1966}, mrnumber = {0216072}, zbl = {0219.34035}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1966__2_3_a1/} }
Vosmanský, Jaromír. The monotonicity of extremants of integrals of the differential equation $y''+q(t)y=0$. Archivum mathematicum, Tome 02 (1966) no. 3, pp. 105-111. http://geodesic.mathdoc.fr/item/ARM_1966__2_3_a1/