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Doğan, Fatih, Çanakkale Onsekiz Mart University
Dolganov, Dmitriy Nikolaevich, Branch KuzGTU in Belovo
Duran, Erol, <h3>Onsekiz Mart University, Faculty of Tourism, Canakkale, Turkey</h3>
Dzambazovski, Kristijan, <h3>Hotel “Ambasador”, Skopje, R. N. Macedonia</h3>
Dzhaparov, Plamen, University of Economics – Varna, Bulgaria
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