Regime shift in fertilizer commodities indicates more turbulence ahead for food security. Elser, J. J, Elser, T. J, Carpenter, S. R, & Brock, W. A PLoS One, 2014.
bibtex   
@article{elser_regime_2014,
	title = {Regime shift in fertilizer commodities indicates more turbulence ahead for food security},
	volume = {9},
	number = {5},
	journal = {PLoS One},
	author = {Elser, James J and Elser, Timothy J and Carpenter, Stephen R and Brock, William A},
	year = {2014},
}

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