Putrus R, رعد, Saleem H, همسة. The existence and uniqueness of the solutions for a system of some fractional order nonlinear differential equations. EDUSJ [Internet]. 2008 Mar. 1 [cited 2025 Aug. 4];21(1):124-37. Available from: https://rjps.uomosul.edu.iq/index.php/edusj/article/view/17270