1.
Putrus R, Saleem H. The existence and uniqueness of the solutions for a system of some fractional order nonlinear differential equations. JES [Internet]. 2008 Mar. 1 [cited 2025 Sep. 10];21(1):124-37. Available from: https://edusj.uomosul.edu.iq/index.php/edusj/article/view/41418