Tzshentke, B., and M. Nichelmann. “Development of Avian Thermoregulatory System During the Early Postnatal Period: Development of the Thermoregulatory Set-Point”. Ornis Fennica 76, no. 4 (December 31, 1999): 189–198. Accessed November 22, 2024. https://ornisfennica.journal.fi/article/view/133514.