HAYAT, T., S. A. SHEHZAD, and M. QASIM. “Slip Effects on the Unsteady Stagnation Point Flow With Variable Free Stream”. Walailak Journal of Science and Technology (WJST), vol. 10, no. 4, Apr. 2013, pp. 385-94, https://wjst.wu.ac.th/index.php/wjst/article/view/334.