Haartman, L. “The Incubation Rhythm of the Female Pied Flycatcher (Ficedula Hypoleuca) in the Presence and Absence of the Male”. Ornis Fennica 35, no. 2–3 (September 30, 1958): 71–76. Accessed December 25, 2024. https://ornisfennica.journal.fi/article/view/132623.