Tanskanen A, Yrjölä RA, Baum U, Tanskanen S, Eriksson J. How many observation days are needed to reliably describe bird migration?. Ornis Svec [Internet]. 2018 Jan. 1 [cited 2024 Nov. 22];28(1):3–13. Available from: https://journals.lub.lu.se/os/article/view/19519