Nitrogen in the central grasslands region of the U.S.:a regional perspective. Burke, I., Lauenroth, W., Cunfer, G., Barrett, J., Mosier, A., & Lowe, P BioScience, 2002.
bibtex   
@article{burke_nitrogen_2002,
	title = {Nitrogen in the central grasslands region of the {U}.{S}.:a regional perspective},
	volume = {52},
	number = {9},
	journal = {BioScience},
	author = {Burke, IC and Lauenroth, WK and Cunfer, G. and Barrett, JE and Mosier, AR and Lowe, P},
	year = {2002},
	keywords = {SGS}
}

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