Bayar, Gokhan. “Development of an Automatic Grading System Based on Energy Circular Hough Transform and Causal Median Filter”. International Journal of Intelligent Systems and Applications in Engineering 5, no. 3 (September 29, 2017): 81–88. Accessed April 29, 2024. https://ijisae.org/index.php/IJISAE/article/view/471.