Fenuga, O. J., et al. “Mathematical Model and Solution for an Unsteady MHD Fourth Grade Fluid Flow over a Vertical Plate in a Porous Medium With Magnetic Field and Suction Injection Effects”. Journal of Scientific Research, vol. 12, no. 4, Sept. 2020, pp. 485-98, doi:10.3329/jsr.v12i4.45551.