#tu-tien
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![International Review of Hydrobiology Volume 75 issue 1 1990 [doi 10.1002/iroh.19900750107] Dr. Eva Pip; Klaus Philipp -- Seasonal Changes in the Chemical Composition of Ceratophyllum](https://static.cupdf.com/doc/330x215/577cd6241a28ab9e789bc944/international-review-of-hydrobiology-volume-75-issue-1-1990-doi-101002iroh19900750107.jpg)
