Eeva, T., Lehikoinen, E. and Veistola, S. (1989) “Habitat preference and breeding performance in four hole-nesting passerines at the northern limit of their range”, Ornis Fennica, 66(4), pp. 142–150. Available at: https://ornisfennica.journal.fi/article/view/133288 (Accessed: 19May2024).