List of Articles Parastu Farhaadi Article 1 - PROVIDING A MODEL FOR REDUCING DRUG SUPPLY CHAIN COST WITH USING DESIGN OF EXPERIMENTS; CASE STUDY: IMAM ALI (AS) CARDIOVASCULAR HOSPITAL OF KERMANSHAH CITY 20.1001.1.25382217.2021.15.1.9.8 Mohammad Ehsanifar Parastu Farhaadi Sina Shalibeik Theory of Approximation and Applications , Issue 1 , Year , Winter 2021