Fractional Differential Calculus · Volume 3, Issue 1 An Opial-Type inequality for fractional derivatives of two functions 03-04 Pages 55-68 DOI 10.7153/fdc-03-04 Downloads Short PDF Full PDF PNG Authors Maja Andrić Josip Pečarić Ivan Perić Keywords Riemann-Liouville fractional derivative Caputo fractional derivative Canavati fractional derivative Opial inequality Subject classes 26A33 26D15