فهرس المقالات امیر ایازی المقاله 1 - Determination of the amplitude-frequency for strongly nonlinear oscillator by two approximate analytical techniques 10.1186/2251-7235-7-38 Amir Ayazi Hadi Ebrahimi Khah Journal of Theoretical and Applied Physics , العدد 1 , السنة 0 , زمستان 2013
