LUKANOV, Simeon; NIKOLOV, Boris. Using acoustic indices in a protected wetland: a case study from Dragoman Marsh, Bulgaria. Ecological Questions, [S. l.], v. 36, n. 4, p. 1–18, 2025. DOI: 10.12775/EQ.2025.043. Disponível em: https://apcz.umk.pl/EQ/article/view/56954. Acesso em: 11 dec. 2025.