@article {3173,
	title = {"Cladism" as a philosophy of classification},
	journal = {Systematic Zoology},
	volume = {20},
	year = {1971},
	pages = {373-376},
	keywords = {CLADISTICS, CLASSIFICATION, PHILOSOPHY},
	author = {Nelson, G.}
}
@article {3174,
	title = {Paraphyly and polyphyly:redefinition},
	journal = {Systematic Zoology},
	volume = {20},
	year = {1971},
	pages = {471-472},
	keywords = {CLADISTICS, paraphyly},
	author = {Nelson, G.}
}
