The origin of the savanna biome. Beerling, D. J. & Osborne, C. P. Global Change Biology, 12(11):2023–2031, November, 2006.
The origin of the savanna biome [link]Paper  doi  bibtex   
@article{beerling_origin_2006,
	title = {The origin of the savanna biome},
	volume = {12},
	issn = {1354-1013, 1365-2486},
	url = {http://doi.wiley.com/10.1111/j.1365-2486.2006.01239.x},
	doi = {10.1111/j.1365-2486.2006.01239.x},
	language = {en},
	number = {11},
	urldate = {2019-04-26},
	journal = {Global Change Biology},
	author = {Beerling, David J. and Osborne, Colin P.},
	month = nov,
	year = {2006},
	pages = {2023--2031},
}

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