KOLEVA, V.; KOYNOVA, T.; DRAGOEVA, A.; KOLEV, N.; KULEVA, I.; NATCHEV, N. 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. 1–11, 2023. DOI: 10.12775/EQ.2024.016. Disponível em: https://apcz.umk.pl/EQ/article/view/43382. Acesso em: 13 jul. 2024.