Abderrezaq Kalkoul. The Role of Economic Intelligence in Achieving a Sustainable Competitive Environment: A Case Study of Algeria Telecom, Mobilis, Djezzy, and Ooredoo. jier [Internet]. 2025 May 26 [cited 2026 Apr. 2];5(2). Available from: https://www.jier.org/index.php/journal/article/view/2802