@article{106941, author = {Miroslav Bartu\v sek}, title = {Monotonicity theorems concerning differential equations $y''+f(t,y,y')=0$}, journal = {Archivum Mathematicum}, volume = {012}, year = {1976}, pages = {169-178}, zbl = {0354.34031}, mrnumber = {0430410}, language = {en}, url = {http://dml.mathdoc.fr/item/106941} }
Bartušek, Miroslav. Monotonicity theorems concerning differential equations $y''+f(t,y,y')=0$. Archivum Mathematicum, Tome 012 (1976) pp. 169-178. http://gdmltest.u-ga.fr/item/106941/
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