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Uddin, M.A., Ullah, M.W. and Bipasha, R.S. 2015. An approximate analytical technique for solving second order strongly nonlinear generalized duffing equation with small damping. Journal of Bangladesh Academy of Sciences. 39, 1 (Jun. 2015), 103–114. DOI:https://doi.org/10.3329/jbas.v39i1.23664.