LARSSON, Leif. Wintering raptors in Kvismaredalen 1954/55—1989/90. Ornis Svecica, Lund, Sweden, v. 3, n. 3–4, p. 93–106, 1993. DOI: 10.34080/os.v3.23034. Disponível em: https://journals.lub.lu.se/os/article/view/23034. Acesso em: 27 apr. 2024.