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
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
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., Hormann, M.
, Bregnballe, T., Frikke, J., Günther, K., Hälterlein, B., Körber, P. & Scheiffarth, G. (2019).
Trends of Migratory and Wintering Waterbirds in the Wadden Sea 1987/1988 - 2016/2017. Common Wadden Sea Secretariat. Wadden Sea Ecosystem No. 39
https://www.sovon.nl/sites/default/files/doc/2019_ecosystem39_trends_of_waterbirds.pdf
Blew, J., Günther, K., Hälterlein, B., Kleefstra, R.
, Laursen, K. & Scheiffarth, G. (2016).
Trends of Migratory and Wintering Waterbirds in the Wadden Sea 1987/1988-2013/2014. Wilhelmshaven: Common Wadden Sea Secretariat (CWSS).
Blew, J., Günther, K., Hälterlein, B., Kleefstra, R.
, Laursen, K. & Scheiffarth, G. (2015).
Trends of Migratory and Wintering Waterbirds in the Wadden Sea 1987/1988-2011/2012. Common Wadden Sea Secretariat. Wadden Sea Ecosystem Vol. 34
Blew, J., Günther, K., Hälterlein, B., Kleefstra, R.
, Laursen, K. & Scheiffarth, G. (2013).
Trends of Migratory and Wintering waterbirds in the Wadden Sea 1987/1988-2010/2011.
Wadden Sea Ecosystem, (31), 1-53.
Koffijberg, K.
, Laursen, K., Hälterlein, B., Reichert, G., Frikke, J. & Soldat, L. (2015).
Trends of Breeding Birds in the Wadden Sea 1991-2013. In
Wadden Sea Ecosystem (Vol. 35, pp. 1-50).