Nilsson, Jan-Eric. “Reduction of Number of Eggs in a Common Clutch of Two Co-Breeding Females of Pied Flycatcher Ficedula Hypoleuca”. Ornis Svecica 15, no. 1 (January 1, 2005): 44–46. Accessed November 22, 2024. https://journals.lub.lu.se/os/article/view/22750.