1. Environmental stress in five aquatic ecosystems in the floodplain of the river Rhine;Admiraal;Sci. Total Environ.,1989
2. The rivers Rhine and Meuse in The Netherlands: present state and signs of ecological recovery;Admiraal;Hydrobiologia,1993
3. The Biometry of Plant Growth;Causton,1981
4. Studies on germination and growth of a river macrophyte (Potamogeton nodosus Poir.) in relation to substrate type and water quality;Coops;Verh. Int. Verein Limnol.,1993
5. Waterplanten in relatie tot waterkwaliteit en bodemgesteldheid 2;De Lyon,1986