TURKISH JOURNAL OF MATHEMATICS, cilt.45, sa.3, ss.1149-1165, 2021 (SCI-Expanded)
By application of some fixed point theorems, that is, the Banach fixed point theorem, Schaefer's and the LeraySchauder fixed point theorem, we establish new existence results of solutions to boundary value problems of fractional differential equations. This paper is motivated by Agarwal et al. (Georgian Math. J. 16 (2009) No.3, 401-411).