Borgström, Erik. “Mixed Clutches of Pied Flycatcher Ficedula Hypoleuca, Blue Tit Parus Caeruleus, and Great Tit P. Major”. Ornis Svecica 15, no. 1 (January 1, 2005): 43–44. Accessed November 22, 2024. https://journals.lub.lu.se/os/article/view/22304.