Nagy, S., Langendoen, T., Frost, T.
, Jensen, G. H., Markones, N., Mooij, J., Paquet, J-Y. & Suet, M. (2022).
Towards improved population size estimates for wintering waterbirds.
Ornithologischer Beobachter,
119(4), 348-361.
https://www.ala-schweiz.ch/index.php/ornithologischer-beobachter/alle-ausgaben
Kleefstra, R.
, Bregnballe, T., Frikke, J., Günther, K., Hälterlein, B., Hansen, M. B., Hornman, M., Ludwig, J., Meyer, J. & Scheiffarth, G. (2022).
Trends of Migratory and Wintering Waterbirds in the Wadden Sea 1987/1988 - 2019/2020. Common Wadden Sea Secretariat (CWSS), Wilhelmhaven, Germany. Wadden Sea Ecosystem No. 41
https://www.waddensea-worldheritage.org/
Kleefstra, R.
, Bregnballe, T., Frikke, J., Gnep, B., Günther, K., Hälterlein, B., Hansen, M. B., Hornman, M., Koffijberg, K., Meyer, J., Reichert, G., Scheiffarth, G. & Umland, J. (2022).
Trends of waterbird populations in the Wadden Sea in comparison with flyway trends. In M. van Roomen, G. Citegetse, O. Crowe, T. Dodman, W. Hagemeijer, K. Meise & H. Schekkerman (Eds.),
East Atlantic Flyway assessment 2020: The status of coastal waterbird populations and their sites (pp. 55-61). Wadden Sea Flyway Initiative p/a CWSS.
https://www.waddensea-worldheritage.org/sites/default/files/2022_East%20Atlantic%20Flyway%20assessment%202020.pdf