Refice A, Souid MS, Yakar A. Some qualitative properties of nonlinear fractional integro-differential equations of variable order. Int. J. Optim. Control, Theor. Appl. (IJOCTA) [Internet]. 2021 Dec. 31 [cited 2025 Jan. 22];11(3):68-7. Available from: http://ijocta.org/index.php/files/article/view/1198