1. Space Columbus. 55 years of Yuri Gagarin's flight. Available at: http://tass.ru/spec/gagarin (accessed 03.05.2021). (In Russ.)
2. Space tourism. Who can afford it. Available at: http://fb.ru/article/53264/kosmicheskiy-turizm-kto-mojet-ego-sebe-pozvolit (accessed 03.05.2021). (In Russ.)
3. Monastyrnaya V.S. Space tourism: pros and cons. Aktual'nye problemy aviatsii i kosmonavtiki, 2016, vol. 2, no. 12, pp. 684–685. Available at: http://elibrary.ru/item.asp?id=28146520. (In Russ.)
4. The impact of COVID-19 on the space industry. Available at: http://roscongress.org/materials/vliyanie-covid-19-na-kosmicheskuyu-promyshlennost/ (accessed 14.06.2021). (In Russ.)
5. Bodnya A.A. Space travel as an innovation in the field of tourist services. In: Tourism and hospitality through the prism of innovations: collection of articles of research and practical conference. Kursk: Zakrytoe aktsionernoe obshchestvo «Universitetskaia kniga», 2017, pp. 17–20. Available at: http://elibrary.ru/item.asp?id=29082510. (In Russ.)