@article {6844,
	title = {Outgroup analysis and parsimony},
	journal = {Systematic Zoology},
	volume = {33},
	year = {1984},
	note = {PDF},
	pages = {83{\textendash}103},
	author = {Maddison, W. P. and Donoghue, M. J. and Maddison, D. R.}
}
