M. Halonen and M. Kuitunen, “Feeding time and brood rearing capacity in the Pied Flycatcher Ficedula hypoleuca”, Ornis Fenn, vol. 75, no. 1, pp. 39–45, Mar. 1998, Accessed: Nov. 15, 2025. [Online]. Available: https://ornisfennica.journal.fi/article/view/133479