The Impact of Marketing Innovation on Achieving the Competitive Advantage of Economic Institutions- A Case Study of Communication Institutions (Mobilis, Djazzy, Ooredoo) Agencies in Wilaya of El Oued-. jier [Internet]. 2025 May 7 [cited 2026 Aug. 10];5(2). Available from: https://www.jier.org/index.php/journal/article/view/2646