%0 Journal Article %A Ahmed A. Hamoud %A Nedal M. Mohammed %A Rasool Shah %T Theoretical analysis for a system of nonlinear $\phi$-Hilfer fractional Volterra-Fredholm integro-differential equations %J Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika %D 2023 %P 216-229 %V 16 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/JSFU_2023_16_2_a6/ %G en %F JSFU_2023_16_2_a6