Differential Equations & Applications · Volume 14, Issue 3 On the periodic solutions for nonlinear Volterra-Fredholm integro-differential equations with ψ-Hilfer fractional derivative 14-31 Pages 447-467 DOI 10.7153/dea-2022-14-31 Downloads Short PDF Full PDF PNG Authors Soufyane Bouriah Djamal Foukrach Mouffak Benchohra Yong Zhou Keywords generalized Hilfer fractional derivative existence uniqueness periodic solutions coincidence degree theory Volterra-Fredholm integro-differential equation Subject classes 34A08 34A12 34B40 45J05