D. D. GANJI, M. FAKOUR, A. VAHABZADEH, and S. H. H. KACHAPI, “Accuracy of VIM, HPM and ADM in Solving Nonlinear Equations for the Steady Three-Dimensional Flow of a Walter’s B Fluid in Vertical Channel”, Walailak J Sci & Tech, vol. 11, no. 7, pp. 593–609, Dec. 2013.