Elham Pourmokhtar(1), Reza Moghaddasi(2), Amir Mohammad Nejad(3), Seyed Safdar Hosseini(4), (1) Department of Agricultural Economics, Faculty of Agriculture and Natural Resources, Islamic Azad University, Science and Research Branch, Tehran, Iran (2) Faculty of Agriculture and Natural Resources, Islamic Azad University, Science and Research Branch, Tehran, Iran (3) Faculty of Agriculture and Natural Resources, Islamic Azad University, Science and Research Branch, Tehran, Iran (4) Faculty of Agriculture and Natural Resources, Islamic Azad University, Science and Research Branch, Tehran, Iran
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