1.
Hedenström A, Pettersson J. Migration routes and wintering areas of Willow Warblers Phylloscopus trochilus (L.) ringed in Fennoscandia. Ornis Fenn [Internet]. 31 december 1987 [citerad 18 maj 2024];64(4):137–143. Tillgänglig vid: https://ornisfennica.journal.fi/article/view/133244