Links[1] https://www.tourism.government.bg/sites/tourism.government.bg/files/documents/2021-12/20211129_pravila_zima_2021_i_2022.pdf [2] https://www.tourism.government.bg/sites/tourism.government.bg/files/documents/2021-12/20211129_pravila_zima_2021_i_2022_en.pdf