Aho, T., Kuitunen, M., Suhonen, J. and Jäntti, A. 2010. Determination of clutch size in Treecreepers Certhia familiaris under food and time constraints. Ornis Fennica. 87, 3 (Sep. 2010), 77–92. DOI:https://doi.org/10.51812/of.133745.