Ojanen, M., M. Orell, and R. A. Väisänen. “Egg Size Variation Within Passerine Clutches: Effects of Ambient Temperature and Laying Sequence”. Ornis Fennica 58, no. 3 (September 30, 1981): 93–108. Accessed May 17, 2024. https://ornisfennica.journal.fi/article/view/133071.