De Jong, F., Bakker, J., van Berkel, C.
, Dahl, K., Dankers, N., Gätje, C., Marencic, H. & Potel, P. (Ed.) (1999).
1999 Wadden Sea Quality Status Report. Common Wadden Sea Secretariat, Trilateral Monitoring and Assessment Group. Wadden Sea Ecosystem Vol. 9
Loke, E., Rauch, W.
, Carstensen, J., Harremöes, P., Joliffe, I. B. (Ed.) & Ball, J. E. (Ed.) (1999).
A Methodology Overview for Water Quality Problems. In I. B. Joliffe & J. E. Ball (Eds.),
Proceedings of the Eighth International Conference on Urban Storm Drainage. Sydney Hilton Hotel, Sydney, Australia, 30 August - 3 September 1999: Volume 2 (pp. 665-673). Institution of Engineers, Australia.