Sharma, P.K., Sharma, B.K. and Chaudhary, R.C. 2007. Unsteady free covection oscillatory couette flow through a porous medium with periodic wall temperature. Tamkang Journal of Mathematics. 38, 1 (Mar. 2007), 93–102. DOI:https://doi.org/10.5556/j.tkjm.38.2007.97.