@article{ARM_1976_12_4_a0,
author = {Bartu\v{s}ek, Miroslav},
title = {Monotonicity theorems concerning differential equations $y''+f(t,y,y')=0$},
journal = {Archivum mathematicum},
pages = {169--178},
year = {1976},
volume = {12},
number = {4},
mrnumber = {0430410},
zbl = {0354.34031},
language = {en},
url = {http://geodesic.mathdoc.fr/item/ARM_1976_12_4_a0/}
}
Bartušek, Miroslav. Monotonicity theorems concerning differential equations $y''+f(t,y,y')=0$. Archivum mathematicum, Tome 12 (1976) no. 4, pp. 169-178. http://geodesic.mathdoc.fr/item/ARM_1976_12_4_a0/
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