Differential Equations & Applications · Volume 12, Issue 4 Existence and uniqueness for fractional order functional differential equations with Hilfer derivative 12-21 Pages 323-336 DOI 10.7153/dea-2020-12-21 Downloads Short PDF Full PDF PNG Authors Fatma Karakoç Keywords Hilfer fractional derivative delay differential equation neutral differential equation Banach fixed point theorem Subject classes 34A08 26A33