A dynamics approach for modeling inventory fluctuations of the pharmaceutical supply chain in covid ۱۹ pandemic

Department of Industrial Management, Bandar-e- Anzali International Branch, Islamic Azad University, Bandar-e-Anzali, Iran

Department of Industrial Management, Science and Research Branch, Islamic Azad University, Tehran, Iran

Department of Industrial Management, Rasht Branch, Islamic Azad University, Rasht, Iran