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 C.  Wigand, J.  Wehr, K. E.  Limburg, B.  Gorham, S.  Longergan, and S. E. G.  Findlay, ?Effect of Vallisneria americana (L.) on community structure and ecosystem function in lake mesocosms?, Hydrobiologia, vol. 418, p. 137-146, 2000.\par \par }