ABTAN, R. A. The Study Effect of Lighting of Non – Regular on Statistical Properties for the Written Text on Whiteboard. Ibn AL-Haitham Journal For Pure and Applied Sciences, Baghdad, Iraq., v. 24, n. 2, 2017. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/789. Acesso em: 30 mar. 2025.