Abidat, Sarra, and Cherifa Labed brinis. 2026. “Evaluation the Effect of the Service Quality of Higher Education on the Doctoral Students Loyalty Using HedPERF Measurement Scale at University of El-Tarf”. Journal of Excellence for Economics and Management Research 10 (1), 90-108. https://journals.lagh-univ.dz/index.php/jeemr/article/view/4587.