Mariyana Bozhinova, Lyubka Ilieva, Lyubomira Todorova, Pavlin Pavlov. BULGARIAN TOURISM DURING THE COVID-19 CRISIS. Proceedings of 9th SWS International Scientific Conference on Social Sciences - ISCSS 2022, 2022, pp. 217-224. https://doi.org/10.35603/sws.iscss.2022/s03.026