List of Articles زنجیره تأمین چهارسطحی Open Access Article Abstract Page Full-Text 1 - Optimization of costs, time and transportation system's reliability in a four-echelon supply chain network; using mixed integer linear programming Poriya Mohammadzadeh-Sagha Ahmad Ebrahimi maryam lotfi Open Access Article Abstract Page Full-Text 2 - Determining the optimal forecasting combination of the four-level supply chain to minimize the bullwhip effect Maryam Daneshmand-Mehr Marzban Najafi Ramin Sadeghian