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 K. K.  McLauchlan, J. M.  Craine, W. W.  Oswald, P. R.  Leavitt, and G. E.  Likens, ?Changes in nitrogen cycling during the past century in a northern hardwood forest?, Proc. Nat. Acad. Sci., vol. 104, p. 7466-7470, 2007.\par \par }