@article {2980,
	title = {Factors Involved in the Persistence of Montane Treeless Balds},
	journal = {Ecology},
	volume = {38},
	year = {1957},
	month = {January},
	pages = {140-142},
	keywords = {Ecosystem, Grassy balds},
	author = {Billings, W. D and Mark, A. F}
}
