@article{Oliveski_2008 author = {Rejane De C. Oliveski and Ligia D. F. Marczak}, title = {Natural Convection in a Cavity Filled with a Porous Medium with Variable Porosity and Darcy Number}, journal = {Journal of Porous Media}, issn = {1091-028X}, year = {2008}, volume = {11}, number = {7}, pages = {655--667} }