“…At the same time examining coupled systems associated with integral equations is important as well, because such systems model many physical problems, (see e.g. El-Sayed & Al-Fadel, 2018;Hashem & El-Sayed, 2017;Zhang, 2018). Recently ( 1.2) where 0 < b j < 1, j ¼ 1, 2, and J b j is the Riemann-Liouville fractional order integral operator.…”