%0 Journal Article %A Zentar, Oualid %A Ziane, Mohamed %A Horani, Mohammed Al %T Theoretical study of a $\varphi $-Hilfer fractional differential system in Banach spaces %J Canadian mathematical bulletin %D 2024 %P 742-759 %V 67 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/S0008439524000134/ %R 10.4153/S0008439524000134 %F 10_4153_S0008439524000134