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http://nl.wikipedia.org/wiki/Schedefonteinkruid 2
http://wilde-planten.nl/schedefonteinkruid.htm 3
Van den Berg M.S.,
M. Scheffer, E. van Nes W. Joosse & H. Coops (
1999) Dynamics and stability of Chara sp. and Potamogeton pectinatus in a shallow lake changing in eutrophication level. Hydrobiologia 408/409: 335-3422003) A statistical model predicting the occurrence and dynamics of submerged macrophytes in shallow lakes in the Netherlands. Hydrobiologia 611:623.
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Scheffer, M., 1998, Ecology of Shallow Lakes. Chapman and Hall, London, 357 pp.