Anh ND, Hai NQ, Schiehlen W. Extended averaged equation method and application on analyzing some nonlinear deterministic vibrations. Vietnam J. Mech. [Internet]. 2009 Mar. 18 [cited 2024 Apr. 26];31(1):1-16. Available from: https://vjs.ac.vn/index.php/vjmech/article/view/5490