I. O. Hamad and S. H. Jumha, “On Some Types of Functions in Nonstandard Analysis”, SJUOZ, vol. 4, no. 2, pp. 253–257, Dec. 2016, Accessed: Dec. 20, 2025. [Online]. Available: https://www.sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/358