John Aber, William McDowell, Knute Nadelhoffer, Alison Magill, Glenn Berntson, Mark Kamakea, Steven McNulty, William Currie, Lindsey Rustad, Ivan Fernandez, Nitrogen Saturation in Temperate Forest EcosystemsBioScience. ,vol. 48, pp. 921- 934 ,(1998) , 10.2307/1313296