M. Milonoff and H. Lindén, “Sexual differences in energy allocation of Capercailie Tetrao urogallus chicks”, Ornis Fenn, vol. 66, no. 2, pp. 62–68, Jul. 1989, Accessed: Nov. 24, 2025. [Online]. Available: https://ornisfennica.journal.fi/article/view/133277