@article{120254,
author = {J\'an Andres and Vladim\'\i r Vl\v cek},
title = {Note to the existence of periodic solutions for higher-order differential equations with nonlinear restoring term and time-variable coefficients},
journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
volume = {30},
year = {1991},
pages = {149-157},
zbl = {0757.34031},
mrnumber = {1166434},
language = {en},
url = {http://dml.mathdoc.fr/item/120254}
}
Andres, Ján; Vlček, Vladimír. Note to the existence of periodic solutions for higher-order differential equations with nonlinear restoring term and time-variable coefficients. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 30 (1991) pp. 149-157. http://gdmltest.u-ga.fr/item/120254/
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