Thingstad, P. G. “Annual and Local Reproductive Variations of a Pied Flycatcher Ficedula Hypoleuca Population Near a Subalpine Lake in Central Norway”. Ornis Fennica 74, no. 1 (March 31, 1997): 39–49. Accessed November 25, 2024. https://ornisfennica.journal.fi/article/view/133456.