The effect of differentiation strategy on achieve competitive advantage: survey comparison between the companies maintenance service. Journal of Accounting and Financial Studies ( JAFS ), [S. l.], v. 6, n. 14, 2011. DOI: 10.34093/jafs.v6i14.670. Disponível em: https://www.jpgiafs.uobaghdad.edu.iq/index.php/JAFS/article/view/670. Acesso em: 1 may. 2025.