List of Articles Open Access Article Abstract Page Full-Text 1 - Stability and Iterative Procedures for Quadrupled Fixed Point in Partially Ordered Metric Spaces Samuel Aniki https://doi.org/10.82521/IJO.2021.1018824 20.1001.1.25885723.2021.13.4.1.0 Open Access Article Abstract Page Full-Text 2 - Analysis of evaluation model of organizational units' performance with Sink-Tuttle approach using data envelopment analysis Nazila Adabavazeh Ahmad Edalatpanah Mehrzad Nvabakhsh https://doi.org/10.82521/IJO.2021.1018855 20.1001.1.25885723.2021.13.4.2.1 Open Access Article Abstract Page Full-Text 3 - Evaluation of Countries Environmental Efficiency Using Data Envelopment Analysis Mina Moshfegh Mohsen Rostami Malkhalifeh https://doi.org/10.82521/IJO.2021.1018854 20.1001.1.25885723.2021.13.4.3.2 Open Access Article Abstract Page Full-Text 4 - Technology Decomposition and Energy Intensity in OPEC Countries: DEA-Malmquist Approach Mehdi Fallah Jelodar Somaye Sadeghi https://doi.org/10.82521/IJO.2021.1018858 20.1001.1.25885723.2021.13.4.4.3 Open Access Article Abstract Page Full-Text 5 - Implementing Fuzzy DEA into the PEM Model for Performance Evaluation of Project-based Organizations: A case study Owais Torabi Mohammad Milad Ahmadi Ruhollah Tavallaei https://doi.org/10.82521/IJO.2021.1018829 20.1001.1.25885723.2021.13.4.5.4 Open Access Article Abstract Page Full-Text 6 - A Branch and Bound for single machine stochastic batch scheduling with delivery costs. A Chance Constraint approach (Case study in Iran) Hamidreza Haddad https://doi.org/10.82521/IJO.2021.1018801 20.1001.1.25885723.2021.13.4.6.5 Open Access Article Abstract Page Full-Text 7 - Nonparametric Model of Preferred Efficiency for Interval Scale Data (DEA) Hosein Abbasiyan https://doi.org/10.82521/IJO.2021.1018905 Open Access Article Abstract Page Full-Text 8 - A Hybrid Method for Automatic Plant Leaf Disease Identification Using Whale Optimization Algorithm and Convolutional Neural Networks Zahra Akeshteh Parvaneh Asghari Seyyed Hamid Haji Seyyed Javadi Hamidreza Navidi Ghaziani https://doi.org/10.82521/IJO.2021.1018910