@article {21,
	title = {Species richness, hotspots, and the scale dependence of range maps in ecology and conservation},
	journal = {Proceedings of the National Academy of SciencesProceedings of the National Academy of Sciences},
	volume = {104},
	number = {33},
	year = {2007},
	pages = {13384-13389},
	isbn = {0027-8424},
	author = {Hurlbert, Allen H and Jetz, Walter}
}
@article {22,
	title = {Cross-scale variation in species richness{\textendash}environment associations},
	journal = {Global Ecology and BiogeographyGlobal Ecology and Biogeography},
	volume = {20},
	number = {3},
	year = {2011},
	pages = {464-474},
	isbn = {1466-8238},
	author = {Belmaker, Jonathan and Jetz, Walter}
}
