@article {635,
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	journal = {Systematic Botany},
	volume = {10},
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	pages = {205-223},
	chapter = {205},
	author = {Trivett, M.L. and Rothwell, Gar W.}
}
@article {615,
	title = {Lignophyte phylogeny and the evolution of spermatophytes: a numerical cladistic analysis},
	journal = {Systematic Botany},
	volume = {19},
	year = {1994},
	pages = {443-482},
	chapter = {443},
	author = {Rothwell, Gar W. and Serbet, R.}
}
