Abdul Rehman , Ping Wu *, Sana Shoukat and Li Wang. “Convection, Segregation and Pattern Formation in Horizontally Vibrated Granular Materials”. International Journal of Emerging Trends in Science and Technology, Vol. 4, no. 11, Nov. 2017, pp. 6328-37, http://igmpublication.org/ijetst.in/index.php/ijetst/article/view/1194.