OLOFSSON, E. Winter feeding by the Great Tit, Parus major, on eggs of the European pine sawfly, Neodiprion sertifer. Ornis Fennica, [S. l.], v. 63, n. 3, p. 91–92, 1986. Disponível em: https://ornisfennica.journal.fi/article/view/133213. Acesso em: 16 may. 2024.