Dierschke V, Delingat J. Stopover of Northern Wheatears Oenanthe oenanthe at Helgoland: where do the migratory routes of Scandinavian and Nearctic birds join and split?. Ornis Svec [Internet]. 2003 Jul. 1 [cited 2024 Nov. 23];13(2–3):53-61. Available from: https://journals.lub.lu.se/os/article/view/22807