Thessing, A. “Growth and Heritability of Size Traits of Willow Tit Parus Montanus Nestlings-a Supplementary Feeding Experiment”. Ornis Fennica 76, no. 3 (September 30, 1999): 107–114. Accessed November 22, 2024. https://ornisfennica.journal.fi/article/view/133505.