K Sivak Kumar, V. K., Abdullah, A., & Basuno, B. (2022). Comparative Study of Two Dimensional Boundary Layer over NACA 23012 and NACA 23021 Airfoils by Using Keller’s Box Method. Journal of Advanced Mechanical Engineering Applications, 3(1), 25-33. https://penerbit.uthm.edu.my/ojs/index.php/jamea/article/view/11391