List of Articles Inefficiency Open Access Article Abstract Page Full-Text 1 - An extended of multiple criteria data envelopment analysis models for ratio data Javad Gerami Open Access Article Abstract Page Full-Text 2 - Generalization of the RDM model in Data Envelopment Analysis Hamed Taherzadeh Ghasem Tohidi Bo Hsiao Open Access Article Abstract Page Full-Text 3 - Computation of Output Losses due to Congestion in Data Envelopment Analysis M. Khodabakhshi H. Zare Haghighi Open Access Article Abstract Page Full-Text 4 - A technique for identifying congestion in Data Envelopment Analysis Amin Jabbari Farhad Hosseinzadeh Lotfi Mohsen Rostamy Malkhalifeh