Fox, A. D., Clausen, K., Dalby, L., Christensen, T. and Sunde, P. (2016) “Between-year variations in sex/age ratio bias in hunter wings of Eurasian Wigeon (Anas penelope) compared to field samples”, Ornis Fennica, 93(1), pp. 26–30. doi: 10.51812/of.133885.