Abderrahim Belbali, Abdessalam Belbali, Mohammed Amine Gasmi, Samir Ouldbahammou, Ali Yousfat, Ahmed Oukacha Azizi, “Measuring and Analyzing Economic Diversification Using the Herfindahl-Hirschman Index”, EEL, vol. 14, no. 3, pp. 3025–3037, Oct. 2024.