%0 Journal Article
%T Frequency analysis of large-amplitude oscillation of a rotational pendulum system using He's amplitude-frequency formulation (HFAF) and He's energy balance method (HEBM)
%A A. Kargar
%A M. Akbarzade
%J International Journal of Mathematical Analysis
%D 2012
%I 
%U http://www.m-hikari.com/ijma/ijma-2012/ijma-21-24-2012/akbarzadeIJMA21-24-2012.pdf