Kononenko, T. Features of competition in the hospitality industry on the hotel services quality [Text] / T. Kononenko, N. Polstyana // Concepts, strategies and mechanisms of economic systems management in the context of modern world challenges : scientific monograph. - Sofia : VUZF Publishing House “St. Grigorii Bogoslov”, 2021. - С. 270-281..
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Polstyana, N.