HELLE, E.; HELLE, P. Changes in land bird populations on the Krunnit Islands in the Bothnian Bay, 1939–77. Ornis Fennica, [S. l.], v. 56, n. 4, p. 137–147, 1979. Disponível em: https://ornisfennica.journal.fi/article/view/133016. Acesso em: 19 sep. 2024.