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2. A trophic state index for lakes;Carlson;Limnol. Oceanogr.,1977
3. The phosphorus-chlorophyll relationship in lakes;Dillon;Arch. Hydrobiol.,1974
4. Eutrophication parameters and trophic state indices in 30 Swedish waste-receiving lakes;Forsberg;Arch. Hydrobiol.,1980
5. Comparison of trophic state measurements;Lambou;Wat. Res.,1983