“Transient Three-Dimensional Natural Convection in Confined Porous Media with Time-Periodic Boundary Conditions” (2021) Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ), 32(2), pp. 195–227. doi:10.55562/jrucs.v32i2.334.