Rafah K. Hussain, Abdulhakeem Q. Albayati, Farah F. Alkhalid,. “Online Multi-Layers Social Distance Detection in Iraqi Schools”. Turkish Journal of Computer and Mathematics Education (TURCOMAT), vol. 12, no. 6, Apr. 2021, pp. 2103-8, https://turcomat.org/index.php/turkbilmat/article/view/4815.