@inbook {49991,
	title = {Grassland ecosystems},
	booktitle = {Encyclopedia of Biodiversity},
	year = {2011},
	publisher = {Elsevier},
	organization = {Elsevier},
	keywords = {biodiversity, grassland ecosystems},
	author = {O. E. Sala and L. Vivanco and P. Flombaum}
}
