KOLEVA, Vanya; KOYNOVA, Teodora; DRAGOEVA, Asya; KOLEV, Nikolay; KULEVA, Ivayla; NATCHEV, Nikolay. Benefits for visitors provided by protected areas in Bulgaria and willingness to become a conservation volunteer. Ecological Questions, [S. l.], v. 35, n. 2, p. 59–65, 2023. DOI: 10.12775/EQ.2024.016. Disponível em: https://apcz.umk.pl/EQ/article/view/43382. Acesso em: 8 jul. 2025.