LIU, Y. 2018. Solvability of BVPs for impulsive fractional differential equations involving the Riemann-Liouvile fractional derivatives. Studia Universitatis Babeș-Bolyai Mathematica. 63, 1 (Mar. 2018), 79–108. DOI:https://doi.org/10.24193/subbmath.2018.1.06.