Ezat, Samaa M., and Haider Jebur. “Certain Types of M-Compact Functions”. Al-Mustansiriyah Journal of Science 28, no. 1 (November 19, 2017): 137–141. Accessed October 3, 2022. https://mjs.uomustansiriyah.edu.iq/index.php/MJS/article/view/323.