WARD, David H; DERKSEN, Dirk V; KHARITONOV, Sergei P; STISHOV, Mikhail; BARANYUK, Vasily V. Status of Pacific Black Brant Branta bernicla nigricans on Wragel Island, Russian Federation. Wildfowl, [S. l.], p. 39–48, 1993. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154703. Acesso em: 16 dec. 2025.