First application of a drone for studies of the biodiversity of Bulgarian extremophilic algae in the Marikostinovo thermal complex. Год. СУ, БФ, Книга 2 - Ботаника [Internet]. 2019 Jan. 1 [cited 2025 Dec. 14];103:5-37. Available from: https://annual.uni-sofia.bg/index.php/biofac-botany/article/view/1578