BENZID, Youcef; CHERMAT, Imad; KHOUATRA, Saida. An Empirical Analysis of Cost Efficiency in GCC Banking Sector: A Comparative Study between Islamic & Conventional Banks. Copernican Journal of Finance & Accounting, [S. l.], v. 15, n. 2, p. 29–48, 2026. DOI: 10.12775/CJFA.2026.006. Disponível em: https://apcz.umk.pl/CJFA/article/view/73330. Acesso em: 8 oct. 2026.