Halonen, M., and M. Kuitunen. “Feeding Time and Brood Rearing Capacity in the Pied Flycatcher Ficedula Hypoleuca”. Ornis Fennica 75, no. 1 (March 31, 1998): 39–45. Accessed November 22, 2024. https://ornisfennica.journal.fi/article/view/133479.