@article {PIE181,
	title = {Dynamic modeling of nitrogen losses in river networks unravels the coupled effects of hydrological and biogeochemical processes},
	journal = {Biogeochemistry},
	volume = {93},
	year = {2009},
	note = {PI Synthesis},
	pages = {91-116},
	keywords = {anthropogenic nitrogen, denitrification, inorganic nutrients, LINX, LTER-PIE, NHD river network, nitrate loss, nitrate model, nitrate removal efficiency, seasonal},
	doi = {10.1007/s10533-008-9274-8},
	author = {Alexander, R.B. and Bohlke, J.F. and Boyer, E.W. and David, M. and Harvey, J.W. and Mulholland, P.J. and Seitzinger, S.P. and Tobias, C.R. and Tonitto, C. and Wollheim, W.M.}
}
@article {PIE99,
	title = {Pre-industrial and contemporary fluxes of nitrogen through rivers: A global assessment based on typology},
	journal = {Biogeochemistry},
	volume = {68},
	year = {2003},
	note = {PI Synthesis},
	pages = {1-35},
	keywords = {anthropogenic loading, global, inorganic nutrients, LTER-PIE, nitrogen, nitrogen budget, nitrogen yields, rivers, watershed},
	doi = {10.1023/B:BIOG.0000025742.82155.92},
	author = {Green, P.A. and Vorosmarty, C.J. and Meybeck, M. and Galloway, J.N. and Peterson, B.J. and Boyer, E.W.}
}
