Brodin, A., K. Lahti, L. Lens, and J. Suhonen. “A Northern Population of Willow Tits Parus Montanus Did Not Store More Food Than Southern Ones”. Ornis Fennica 73, no. 3 (September 30, 1996): 114–118. Accessed May 18, 2024. https://ornisfennica.journal.fi/article/view/133443.