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1Subjects: “...persian gulf pro league physical protection security sport facilities venue...”
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2Sustainable tourism in sport with emphasis on spectators' contribution in environmental preservationby M.S. Kiani“... Tractor rematch from 15<sup>th</sup> Persian Gulf Pro League. According to Kukran formula sample size...”
Published 2019-10-01
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3“... Gulf Pro League. According to Kukran formula sample size was equal to 722 persons. 920 questionnaires...”
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