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2. Zygnemales aus Unterfranken;Bock;Arch. Hydrobiol.,1956
3. Observaciones sobre la periodicidad de las algas filamentosas de la peninsula del Cap de Creus (Gerone);Cambra,1987
4. An ecological study of ditch vegetation in The Netherlands;De Lange,1976
5. Proposal for a numerical description of the development of aquatic macrophytic vegetation as an aid for the assessment of water quality;De Lange;Wasser Abwasser Forsch.,1973