Mahmoudi, Abdelouahab, and Arezki Kessi. “Existence and Ulam Stability of Solution for Some Backward Impulsive Differential Equations on Banach Spaces”. Armenian Journal of Mathematics 13, no. 8 (November 4, 2021): 1–21. Accessed April 26, 2025. https://armjmath.sci.am/index.php/ajm/article/view/561.