Bregnballe, T, Kleefstra, R, Scheiffarth, G, Günther, K, Hälterlein, B, Ludwig, J, Koffijberg, K, Reichert, G, Umland, J, Frikke, J, Hornman, M, Körber, P, Hansen, M B & van Roomen, M 2018, Trends of waterbird populations in the Wadden Sea in comparison with flyway trends . in M van Roomen, S Nagy, G Citegetse & H Schekkerman (eds), East Atlantic Flyway Assessment 2017: the status of coastal waterbird populations and sites . pp. 33-43 . < https://www.waddensea-worldheritage.org/resources/east-atlantic-flyway-assessment-2017 > Aarhus University