@article {26,
	title = {The demography of range boundaries versus range cores in eastern US tree species},
	journal = {Proceedings of the Royal Society B: Biological SciencesProceedings of the Royal Society B: Biological Sciences},
	volume = {276},
	number = {1661},
	year = {2009},
	pages = {1477-1484},
	isbn = {0962-8452},
	author = {Purves, Drew W}
}
