Journal of Mathematical Inequalities · Volume 8, Issue 4 Opial-type inequalities for two functions with general kernels and applications 08-57 Pages 757-775 DOI 10.7153/jmi-08-57 Downloads Short PDF Full PDF PNG Authors Sajid Iqbal Josip Pečarić Muhammad Samraiz Keywords Opial inequality fractional derivatives Widder derivatives Green's function linear differential operator Subject classes 26D15 26D10 26A33