Hyytiä, K., and P. Vikberg. “Autumn Migration and Moult of the Spotted Flycatcher Muscicapa Striata and the Pied Flycatcher Ficedula Hypoleuca at the Signilskär Bird Station”. Ornis Fennica 50, no. 3–4 (December 31, 1973): 134–143. Accessed November 23, 2024. https://ornisfennica.journal.fi/article/view/132857.