Lundgren, Björn, Anders Hedenström, and Jan Pettersson. “Correlation Between Some Body Components and Visible Fat Index in the Willow Warbler Phylloscopus Trochilus (L.)”. Ornis Svecica 5, no. 2 (April 1, 1995): 75–79. Accessed September 25, 2022. https://journals.lub.lu.se/os/article/view/23007.