Long-term trends in population, farm income, and crop production in the Great Plains. Parton, W., Gutmann, M., & Ojima, D BioScience, 2007.
bibtex   
@article{parton_long-term_2007,
	title = {Long-term trends in population, farm income, and crop production in the {Great} {Plains}},
	volume = {57},
	number = {9},
	journal = {BioScience},
	author = {Parton, WJ and Gutmann, MP and Ojima, D},
	year = {2007},
	keywords = {SGS}
}

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