Akram Al-Saati, N., نجلاء, N. Al-Assady, and نضال. “Improving Gene Expression Programming Method”. AL-Rafidain Journal of Computer Sciences and Mathematics, vol. 6, no. 1, Jan. 2009, pp. 81-95, https://tanmiyat.uomosul.edu.iq/index.php/csmj/article/view/36896.