HuZ. and LiuW. (2013) “Solvability of a Coupled System of Fractional Differential Equations with Periodic Boundary Conditions at Resonance”, Ukrains’kyi Matematychnyi Zhurnal, 65(11), pp. 1463–1475. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2526 (Accessed: 23November2024).