@article {2042,
	title = {Populations, genetic variation, and the delimitation of phylogenetic species},
	journal = {Systematic Biology},
	volume = {41},
	year = {1992},
	pages = {421-435},
	keywords = {PHYLOGENETIC SPECIES CONCEPT, species},
	author = {Davis, Jerrold I. and Nixon, Kevin C.}
}
