De La Sen, M., Hedayati, V., Atani, Y. G. G., & Rezapour, S. (2017). The existence and numerical solution for a k-dimensional system of multi-term fractional integro-differential equations. Nonlinear Analysis: Modelling and Control, 22(2), 188-209. https://doi.org/10.15388/NA.2017.2.4