List of Articles economic production Open Access Article Abstract Page Full-Text 1 - Economic productivity analysis of water and nitrogen fertilizer for tea production with sprinkler irrigation system Kourosh Majd Salimi Ebrahim Amiri Open Access Article Abstract Page Full-Text 2 - 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 Open Access Article Abstract Page Full-Text 3 - Optimal lot size of EPQ model considering imperfect and defective products S.R Hejazi J.C Tsou M Rasti Barzoki