@article {7135,
	title = {Detecting correlated evolution on phylogenies: a general method for the comparative analysis of discrete characters},
	journal = {Proceedings of the Royal Society of London. Series B},
	volume = {255},
	year = {1994},
	note = {PDF},
	pages = {37-45},
	keywords = {characters, comparative method, morphological characters, phylogenetics, statistics},
	author = {Pagel, Mark}
}
