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 Svecica, Lund, Sweden, v. 13, n. 2–3, p. 53–61, 2003. DOI: 10.34080/os.v13.22807. Disponível em: https://journals.lub.lu.se/os/article/view/22807. Acesso em: 23 may. 2022.