H. El-Owaidy, A. M. A. El-Sayed, and Reda Gamal Ahmed. “Existence of Solutions of a Coupled System of Functional Integro-Differential Equations of Arbitrary (fractional) Orders”. Malaya Journal of Matematik 6, no. 04 (October 1, 2018): 774–780. Accessed November 21, 2024. https://www.malayajournal.org/index.php/mjm/article/view/928.