Links
[1] https://www.tourism.government.bg/sites/tourism.government.bg/files/documents/2021-12/zapoved_t-rd-04-24_ot_02.12.2021.pdf
[2] https://www.tourism.government.bg/sites/tourism.government.bg/files/documents/2021-12/20211130_ukazaniya_-_versiya_17.pdf
[3] https://www.tourism.government.bg/sites/tourism.government.bg/files/documents/2021-12/20211109_ukazaniya_mt_covid-19_versiya17_en.pdf