[1] J. H. He, European Journal of Physics, Vol. 29, 2008, pp. 19-22. http://dx.doi.org/10.1088/0143-0807/29/4/L02
[2] J. H. He, International Journal of Nonlinear Science and Numerical Simulation, Vol. 9, 2008, pp. 211-212.
http://dx.doi.org/10.1515/IJNSNS.2008.9.2.211
[3] A. G. Davodi, D. D. Gangi, R. Azami and H. Babazadeh, Modern Physics Letters B, Vol. 23, 2009, pp. 3427-3436.
http://dx.doi.org/10.1142/S0217984909021466
[4] I. Mehdipour, D. D. Ganji and M. Mozaffari, Current Applied Physics, Vol. 10, 2010, pp. 104-112.
http://dx.doi.org/10.1016/j.cap.2009.05.016
[5] D. Younesian, H. Askari, Z. Saadatnia and M. Kalami Yazdi, Computers and Mathematics with Applications, Vol. 59, 2010, pp. 3222-3228.
http://dx.doi.org/10.1016/j.camwa.2010.03.013
[6] H. Askari, M. Kalami Yazdi and Z. Saadatnia, Nonlinear Science Letters A, Vol. 1, 2010, pp. 425-430.
[7] J. H. He, G. C. Wu and F. Austin, Nonlinear Science Letters A, Vol. 1, 2010, pp. 1-30.
[8] N. Herisanu and V. Marinca, Nonlinear Science Letters A, Vol. 1, 2010, pp. 183-192.
[9] J. H. He, International Journal of Modern Physics B, Vol. 20, 2006, pp. 2561-2568.
http://dx.doi.org/10.1142/S0217979206034819
[10] J. H. He, International Journal of Non-Linear Mechanics, Vol. 35, 2000, pp. 37-43.
[11] J. H. He, Chaos, Solitons and Fractals, Vol. 26, 2005, pp. 695-700. http://dx.doi.org/10.1016/j.chaos.2005.03.006
[12] D. D. Ganji, Physics Letters A, Vol. 355, 2006, pp. 337-341. http://dx.doi.org/10.1016/j.physleta.2006.02.056
[13] J. H. He, International Journal of Modern Physics B, Vol. 20, 2006, pp. 1141-1199.
http://dx.doi.org/10.1142/S0217979206033796
[14] L. Xu, Journal of Computational and Applied Mathematics, Vol. 207, 2007, pp. 148-154.
http://dx.doi.org/10.1016/j.cam.2006.07.020
[15] L. Xu, Journal of Sound and Vibration, Vol. 302, 2007, pp. 178-184. http://dx.doi.org/10.1016/j.jsv.2006.11.011
[16] J. H. He, Computer Methods in Applied Mechanics and Engineering, Vol. 178, 1999, pp. 257-262.
http://dx.doi.org/10.1016/S0045-7825(99)00018-3
[17] J. H. H Journal of Sound and Vibration, Vol. 229, 2000, pp. 1257-1263. http://dx.doi.org/10.1006/jsvi.1999.2509
[18] J. H. He, International Journal of Nonlinear Sciences and Numerical Simulation, Vol. 2, 2001, pp. 257-264.
http://dx.doi.org/10.1515/IJNSNS.2001.2.3.257
[19] R. E. Mickens, Journal of Sound and Vibration, Vol. 292, 2006, pp. 964-968.
http://dx.doi.org/10.1016/j.jsv.2005.08.020
[20] T. Ozis and A. Yildirm, Journal of Sound and Vibration, Vol. 306, 2007, pp. 372-376.
http://dx.doi.org/10.1016/j.jsv.2007.05.021
[21] D. D. Ganji, M. Esmaeilpour and S. Soleimani, International Journal of Computer Mathematics, Vol. 9, 2010, pp. 2014-2023.
[22] I. S. Gradshteyn and I. S. Ryzhik, “Table of Integrals, Series and Products,” Academic Press, New York, 1980.
[23] C. W. Lim and S. K. Lai, International Journal of Mechanical Sciences, Vol. 48, 2006, pp. 483-892.
http://dx.doi.org/10.1016/j.ijmecsci.2005.12.009
[24] J. J. Stoker, “Nonlinear Vibrations in Mechanical and Electrical Systems,” Wiley, New York, 1992.
[25] D. W. Jordan and P. Smith, “Nonlinear Ordinary Differential Equations: An Introduction to Dynamical Systems,” Oxford University Press, New York, 1999.