@article {6293,
	title = {Reconstructing phylogeny with and without temporal data},
	journal = {Science},
	volume = {284},
	year = {1999},
	note = {PDF},
	pages = {1816-1819},
	keywords = {paleontology, phylogenetics, stratigraphy},
	author = {Fox, David L. and Fisher, Daniel C. and Leighton, Lindsey R.}
}
