@article {6798,
	title = {A combined morphological and molecular phylogeny for sea urchins (Echinoidea: Echinodermata)},
	journal = {Philosophical Transactions of the Royal Society of London Series B-Biological Sciences},
	volume = {347},
	year = {1995},
	note = {PDF},
	pages = {213-234},
	keywords = {combined data analyses, echinodermata, morphological characters, phylogeny, rDNA},
	author = {Littlewood, D. T. J. and Smith, A. B.}
}
