@article {4152,
	title = {Character weighting and cladistic analysis},
	journal = {Systematic Zoology},
	volume = {35},
	year = {1986},
	pages = {102-109},
	keywords = {CHARACTER WEIGHTING, CLADISTICS, WEIGHTING},
	author = {Wheeler, Q. D.}
}
@article {4154,
	title = {Another way of looking at the species problem: a reply to de Queiroz and Donaghue},
	journal = {Cladistics},
	volume = {6},
	year = {1990},
	pages = {77-81},
	keywords = {CLADISTICS, species, SPECIES CONCEPTS},
	author = {Wheeler, Q. D. and Nixon, Kevin C.}
}
@article {3208,
	title = {An amplification of the phylogenetic species concept},
	journal = {Cladistics},
	volume = {6},
	year = {1990},
	note = {An excellent and concise account of the PSC; ; ;,},
	pages = {211-223},
	keywords = {CLADISTICS, PHYLOGENETIC SPECIES CONCEPT, species},
	author = {Nixon, Kevin C. and Wheeler, Q. D.}
}
@inbook {3209,
	title = {Extinction and the origin of species},
	booktitle = {Extinction and Phylogeny},
	year = {1992},
	pages = {119-143},
	publisher = {Columbia University Press},
	organization = {Columbia University Press},
	address = {New York},
	keywords = {EXTINCTION, PHYLOGENY, species},
	author = {Nixon, K. C. and Wheeler, Q. D.},
	editor = {Novacek, M. J. and Wheeler, Q. D.}
}
