Radiation Effects on Unsteady MHD Free Convective Flow with Hall Current and Mass Transfer Through Viscous Incompressible Fluid Past a Vertical Porous Plate Immersed in Porous Medium with Heat Source/ Sink. (2009). Journal of International Academy of Physical Sciences, 13(3), 231-252. http://www.iaps.org.in/journal/index.php/journaliaps/article/view/189