%0 Journal Article %A Livija Cveticanin %T Asymptotic Method for Truly Non-linear Oscillator with Time Variable Parameter %J ESAIM. Proceedings %D 2013 %P 32-39 %V 39 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.1051/proc/201339005/ %R 10.1051/proc/201339005 %G en %F EP_2013_39_a5