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://jpgiafs.uobaghdad.edu.iq/index.php/JAFS/article/view/670.. Acesso em: 27 apr. 2024.