Mokhtar Boumaaza, Mouffak Benchohra, and Juan J. Trujillo. “Weak Solutions of Coupled Caputo Type Modification of the Erdélyi-Kober Implicit Fractional Differential Systems With Retarded and Advanced Arguments”. Jordan Journal of Mathematics and Statistics 15, no. 1 (May 18, 2025): 15–31. Accessed June 30, 2025. https://jjms.yu.edu.jo/index.php/jjms/article/view/761.