Solutions of a class of singular second-order IVPs by homotopy-perturbation method

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A Jacobi–Gauss collocation method for solving nonlinear Lane–Emden type equations (2012, methodology): “The approximate solutions to the Lane–Emden equation were given by homotopy perturbation method [28,10,11], variational iteration method [29], and Sinc-Collocation method [22], an implicit series solution [26].”
On multistage homotopy-perturbation method applied to nonlinear biochemical reaction model (2008, unknown): “Some applications of the standard HPM on nonlinear problems can be found in [8–19].”