“Report on the International Meeting Payment for Ecosystem Services - Forest for Water (COST Action 15206 PESFOR-W), Albena, Bulgaria”. Годишник на Софийския Университет „Св. Климент Охридски“, Биологически факултет, Книга 2 – Ботаника 102 (January 1, 2018): 141–150. Accessed December 14, 2025. https://annual.uni-sofia.bg/index.php/biofac-botany/article/view/1601.