Ntouyas, Sotiris K., et al. “Generalized Fractional Differential Equations and Inclusions Equipped With Nonlocal Generalized Fractional Integral Boundary Conditions”. Topological Methods in Nonlinear Analysis, vol. 54, no. 2B, July 2019, pp. 1051-73, https://apcz.umk.pl/TMNA/article/view/TMNA.2019.035.