T. Ray Mahapatra S. K. Nandy A. S. Gupta Analytical solution of magnetohydrodynamic stagnation-point flow of a power-law fluid towards a stretching surface. 1696-1710 2009 215 Applied Mathematics and Computation 5 http://dx.doi.org/10.1016/j.amc.2009.07.022 db/journals/amc/amc215.html#MahapatraNG09