List of Articles Nonlinear marginal cost Open Access Article Abstract Page Full-Text 1 - Evaluation of financial efficiency with non-radial model and fuzzy data and inputs and outputs with nonlinear marginal margin with data envelopment analysis technique Saeid savadkouhi Farhad Hosseinzadeh Lotfi Mohammadreza Shahriari Mohsen Vaez-Ghsemi