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References
1.
Haslam, S.M.
1987 : River plants of western Europe . Cambridge : Cambridge University Press .
2.
Hellawell, J.M.
1986 : Biological indicators of freshwater pollution and environmental management . London : Elsevier Applied Science Publishers .
3.
Hynes, H.B.M.
1960 : The biology of polluted waters . Liverpool : Liverpool University Press .
4.
Moss, B.
1988 : Ecology of fresh waters , second edition. Oxford : Blackwell Scientific Publishers .