H. El-Owaidy, A. M. A. El-Sayed and Reda Gamal Ahmed 2018. Existence of solutions of a coupled system of functional integro-differential equations of arbitrary (fractional) orders. Malaya Journal of Matematik. 6, 04 (Oct. 2018), 774–780. DOI:https://doi.org/10.26637/MJM0604/0011.