BLAKE, J. G.; HANOWSKI, J. M.; NIEMI, G. J.; COLLINS, P. T. Hourly variation in transect counts of birds. Ornis Fennica, [S. l.], v. 68, n. 4, p. 139–147, 1991. Disponível em: https://ornisfennica.journal.fi/article/view/133327. Acesso em: 19 sep. 2024.