De Jong, P. D., Dahl, K., Neudekker, T., Knust, R., van Berkel, C. J. M., De Jong, F. (red.), Bakker, J. (red.), van Berkel, C. (red.)
, Dahl, K. (red.), Dankers, N. (red.), Gätje, C. (red.), Marencic, H. (red.) & Potel, P. (red.) (1999).
Selected Fish Species and Brown Shrimp. I
Wadden Sea Ecosystem (s. 148-152). Common Wadden Sea Secretariat, Trilateral Monitoring and Assessment Group.