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Omelchenko, Natalia, Kherson State University
Omoush, Muthana Mohammad, Irbid National University, PO Box 2600, Irbid, 21110, Jordan, muthana-tourism@hotmail.com
Onoyko, Yuriy, Volodymyr Vynnychenko Central Ukrainian State Pedagogical University, Shevchenko st., 1, Kropyvnytskyi, 25006, Ukraine, onoiko0904@ua.fm
Osipov, Vladimir, Institute of Market Problems and Economic-Ecological Researches of NAS Ukraine Frantsuzskiy Boulevard, 29, Odesa, 65044, Ukraine, osipovugkonver@gmail.com
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