Tiainen, J. and Bastianö, H.-V. (1983) “The accuracy of territory mapping tested on Willow Warblers Phylloscopus trochilus and Chiffchaffs Ph. collybita”, Ornis Fennica, 60(4), pp. 112–116. Available at: https://ornisfennica.journal.fi/article/view/133139 (Accessed: 23November2024).