Gabbara, Sami D., and Ghadah A. AL-Sakkal. “Optimal Procedures for Certain Crossed Repeated Measures Model”. EURASIAN JOURNAL OF SCIENCE AND ENGINEERING 5, no. 1 (December 1, 2019): 1–17. Accessed April 21, 2026. https://eajse.tiu.edu.iq/index.php/eajse/article/view/258.