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Cristi Spulbar
University of Craiova, Faculty of Economics and Business Administration, Romania
Mohammad Ehsanifar
Department of Industrial Engineering, Islamic Azad University Technical Engineering Faculty, Arak, Iran
Iran, Islamic Republic of
Ramona Birau
Faculty of Education Science, Law and Public Administration, Constantin Brancusi University of Targu Jiu, Romania
Arezoo Babaie
Department of Civil Engineering, Arak Branch, Islamic Azad University, Arak, Iran
Daniel Iulius Doagă
University of Craiova, Faculty of Economics and Business Administration, Romania
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