Bouchoul, Said, and Souad Djermoun. “The Impact of Participation in Global Value Chains of Services on Per Capita GDP: Standard Study for a Group of Developing Countries in the Period: 2000-2017 ”. Dirassat Journal Economic Issue 11, no. 2 (June 18, 2020): 439-456. Accessed November 28, 2020. http://journals.lagh-univ.dz/index.php/djei/article/view/728.