“Flora, Mycota and Vegetation of Kupena Reserve (Rodopi Mountains, Bulgaria)”. Годишник на Софийския Университет „Св. Климент Охридски“, Биологически факултет, Книга 2 – Ботаника 100 (January 1, 2016): 100–115. Accessed December 14, 2025. https://annual.uni-sofia.bg/index.php/biofac-botany/article/view/1621.