فهرس المقالات managed inventory . Economic production quantity . Supply chain . Particle swarm optimization حرية الوصول المقاله صفحة الملخص نص كامل 1 - A discrete particle swarm optimization algorithm with local search for a production-based two-echelon single-vendor multiple-buyer supply chain Mehdi Seifbarghy Masoud Mirzaei Kalani Mojtaba Hemmati