List of Articles Operational costs Open Access Article Abstract Page Full-Text 1 - Legal analysis of the fiscal regime of IPC upstream contracts in the oil and gas industry in Iran. Alireza Hasanalizadeh ali zare Mehdi Montazer Open Access Article Abstract Page Full-Text 2 - Minimizing the operational costs in a flexible flow shop scheduling problem with unrelated parallel machines Ali Hassani Seyed Mohamad Hasan Hosseini Foroogh Behroozi 10.22094/joie.2021.1890852.1718