Prodanova, Hristina, and Desislava Varadzhakova. “How Individual Scores Affect the Final Expert-Based Assessments of Ecosystem Services: Range and Mean Scores Analysis of Natural Heritage Supply Maps”. European Journal of Geography 13, no. 4 (August 31, 2022): 074–097. Accessed September 29, 2023. https://www.eurogeojournal.eu/index.php/egj/article/view/234.