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 D. J.  Conley, et al., ?Controlling Eutrophication: Nitrogen and Phosphorus?, Science, vol. 323, p. 1014-1015, 2009.\par \par  D. J.  Conley, et al., ?Eutrophication: Time to Adjust Expectations Response?, Science, vol. 324, p. 724-725, 2009.\par \par  D. J.  Conley, et al., ?Response to Letters ?Controlling eutrophication: nitrogen and phosphorus??, Science, vol. 324, p. 721-725, 2009.\par \par  P. M.  Groffman, et al., ?Ecological thresholds: The key to successful environmental management or an important concept with no practical application??, Ecosystems, vol. 9, p. 1-13, 2006.\par \par  K. G.  Porter, et al., ?Microbial interactions in lake food webs?, in S. R. Carpenter (ed.). Complex Interactions in Lake Communities, 1988, p. 209-227.\par \par }