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Wahl, J.; Svenning, J.-C.; Stipniece, A.; Nilsson, L.; Molina, B.; Lorentsen, S.-H.; Lehikoinen, A.; Langendoen, T.; Keller, V.; Hornman, M.; Holt, C. A.; Devos, K.; Deceuninck, B.; Clausen, P.; Crowe, O.; Balsby, T. J. S.; Nagy, S.; Christensen, T.; Dalby, L.; Fox, A. D. Seeking Explanations for Recent Changes in Abundance of Wintering Eurasian Wigeon (Anas Penelope) in Northwest Europe. Ornis Fenn 2016, 93, 12–25.