List of Articles convexity Open Access Article Abstract Page Full-Text 1 - Estimating Production Function under Endogeneity: A Model Based on Data Envelopment Analysis Roghyeh Malekii Vishkaeii Behrooz Danishian Farhad Hosseinzadeh lotfi Open Access Article Abstract Page Full-Text 2 - Calculating Cost Efficiency with Integer Data in the Absence of Convexity Arezoo Khoshgova Mohsen Rostamy-Malkhalifeh Open Access Article Abstract Page Full-Text 3 - Data Envelopment Analysis Models In The Presence Of Ratio Data and Non-Discretionary Factors Azam Ahmadzadeh