Refice, Ahmed, Mohammed Said Souid, and Ali Yakar. “Some Qualitative Properties of Nonlinear Fractional Integro-Differential Equations of Variable Order”. An International Journal of Optimization and Control: Theories & Applications (IJOCTA) 11, no. 3 (December 31, 2021): 68–78. Accessed January 22, 2025. http://ijocta.org/index.php/files/article/view/1198.