1. Tabari, Saloomeh, and Chen, Wei The Impact of COVID-19 on Group Tour Operators and the Implications for Overtourism. Global Strategic Management in the Service Industry: A Perspective of the New Era, 2022.
2. Herfindahl-Hirschman index level of concentration values modification and analysis of their change;Brezina;Central European Journal of Operations Research,2016
3. Market power, competition and earnings management: Accrual-based activities;Chang;Journal of Financial Economic Policy,2019
4. Financial position of the tour operators in the Slovak Republic;Derco;Tourism: An International Interdisciplinary Journal,2018
5. Report from the Commission to the European Parliament and the Council on the Application of Directive (EU) 2015/2302 of the European Parliament and of the Council on Package Travel and Linked Travel Arrangements. 2022.