Differential Equations & Applications · Volume 16, Issue 2 Solvability for a coupled system of 4-sequential fractional differential equations 16-09 Pages 151-169 DOI 10.7153/dea-2024-16-09 Downloads Short PDF Full PDF PNG Authors Kamel Bensassa Zoubir Dahmani Mehmet Zeki Sarikaya Keywords existence uniqueness Banach contraction principle Caputo derivative Subject classes 30C45 39B72 39B85