Tham, Leony, and Roslinda Nazar. “Numerical Solution of Mixed Convection Flow about a Sphere in a Porous Medium Saturated by a Nanofluid: Brinkman Model”. Journal of Science and Technology, vol. 4, no. 2, Dec. 2012, https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/600.