Homotopy perturbation method for thin film flow of a fourth grade fluid down a vertical cylinder

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Modified homotopy perturbation method for solving non-linear Fredholm integral equations (2009, background): “[11]; to the non-linear Voltra–Fredholm integral equations by Ghasemi et al.”
Explicit analytical solutions of the generalized Burger and Burger–Fisher equations by homotopy perturbation method (2009, methodology): “Here, for some cases, the zeroth-order solution of traditional perturbation method [35, 36], can be a good initial guess for the HPM [21, 34].”
Homotopy Perturbation Method for Systems of Partial Differential Equations (2007, methodology): “Recently a great deal of interest has been focused on the applications of the homotopy perturbation method, well addressed in [6-14], In this method the solution is considered as the summation of an infinite series which usually converges rapidly to the exact solutions.”
He's homotopy perturbation method for solving systems of Volterra integral equations of the second kind (2009, unknown): “Introduction The Topic of the He’s homotopy perturbation method [1–6] has been rapidly growing in recent years [7–23].”