HILDÉN, O. Diurnal rhythm of colony attendance and optimal census time for the Black Guillemot Cepphus grylle in the Baltic sea. Ornis Fennica, [S. l.], v. 71, n. 2, p. 61–67, 1994. Disponível em: https://ornisfennica.journal.fi/article/view/133394. Acesso em: 25 nov. 2024.