TY  - JOUR
AU  - Bartušek, Miroslav
TI  - Monotonicity theorems concerning differential equations $y''+f(t,y,y')=0$
JO  - Archivum mathematicum
PY  - 1976
SP  - 169
EP  - 178
VL  - 12
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ARM_1976__12_4_a0/
LA  - en
ID  - ARM_1976__12_4_a0
ER  -