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Chemical reaction and variable viscosity effects on flow and mass transfer of a non-Newtonian visco-elastic fluid past a stretching surface embedded in a porous medium Comments on ‘‘Effects of variable viscosity and thermal conductivity on unsteady MHD flow of non-Newtonian fluid over a stretching porous sheet’’, by Gamal M.Abdel-Rahman [THERMAL SCIENCE: Year 2013, Vol. 17, No. 4, pp. 1035-1047]. 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Megahed, Canadian Journal of Physics, 2014, 92(1): 86-91 Comment on " Flow and heat transfer of a non-Newtonian power-law fluid over a non-linearly stretching vertical surface with heat flux and thermal radiation " by Ahmed M. Megahed , Meccanica 02/2015; DOI: 10.1007/s11012-015-0114-3 Comments on “Variable fluid properties and variable heat flux effects on the flow and heat transfer in a non-Newtonian Maxwell fluid over an unsteady stretching sheet with slip velocity” by Ahmed M. Megahed, Chin. Phys. B Vol. 22, No. 9 (2013) 094701 Comments on “HPM for the slip velocity effect on a liquid film over an unsteady stretching surface with variable heat flux” by Ahmed M. Megahed, Eur. Phys. J. Plus (2011) 126: 82 Comments on " MHD viscous Casson fluid flow and heat transfer with second-order slip velocity and thermal slip over a permeable stretching sheet in the presence of internal heat generation/absorption and thermal radiation " by Ahmed M. Megahed . Eur. Phys. J. Plus (2015) 130: 81 Comments on the two published papers By M.M.Khader and Ahmed M. Megahed In 1. Numerical solution for boundary layer flow due to a nonlinearly stretching sheet with variable thickness and slip velocity [Eur. Phys. J. Plus (2013) 128: 100]. 2. Differential transformation method for studying flow and heat transfer due to stretching sheet embedded in porous medium with variable thickness, variable thermal conductivity, and thermal radiation [Appl. Math. Mech. -Engl. Ed., 35(11), 1387–1400 (2014)]. Comments on “Numerical Solution for Variable Viscosity and Internal Heat Generation Effects on Boundary Layer Flow Over an Exponentially Stretching Porous Sheet with Constant Heat Flux and Thermal Radiation” by Ahmed M. Megahed, Journal of Mechanics, Vol. 30, No. 4, June 2014 Comments on “Homotopy Perturbation Method for Thin Film Flow and Heat Transfer over an Unsteady Stretching Sheet with Internal Heating and Variable Heat Flux” by I-Chung Liu and Ahmed M. Megahed, Journal of Applied Mathematics Volume 2012, Article ID 418527, 12 pages Comments on “Numerical Studies for Flow and Heat Transferof the Powell–Eyring Fluid Thin Film Over an Unsteady Stretching Sheet With Internal Heat Generation Using the Chebyshev Finite Difference Method” by M.M. Khader and Ahmed M. Megahed, Journal of Applied Mechanics and Technical Physics, Vol. 54, No. 3, pp. 440–450, 2013. Comment on “Variable viscosity and slip velocity effects on the flow and heat transfer of a power-law fluid over a non-linearly stretching surface with heat flux and thermal radiation ” Ahmed M. Megahed , Rheologica Acta, 51, pp. 841847 (2012) . Comments on three published papers By M.M.Khader and Ahmed M. Megahed Comments on “Flow and Heat Transfer of Powell–Eyring Fluid due to an Exponential Stretching Sheet with Heat Flux and Variable Thermal Conductivity”by Ahmed M. Megahed, Z. Naturforsch.2015; 70(3)a: 163–169