Nilsson, Jan Eric. “Blue Tit Parus Caeruleus Pair Raises a Pied Flycatcher Ficedula Hypoleuca Nestling”. Ornis Svecica 21, no. 1 (January 1, 2011): 55–57. Accessed November 22, 2024. https://journals.lub.lu.se/os/article/view/22616.