LIU, Yuji. “Solvability of BVPs for Impulsive Fractional Differential Equations Involving the Riemann-Liouvile Fractional Derivatives”. Studia Universitatis Babeș-Bolyai Mathematica, vol. 63, no. 1, Mar. 2018, pp. 79-108, doi:10.24193/subbmath.2018.1.06.