Maddison WP (1990). "A method for testing the correlated evolution of two binary characters: are gains or losses concentrated on certain branches of a phylogenetic tree?". Evolution. 44 (3): 539–557. doi:10.2307/2409434. JSTOR2409434. PMID28567979.
Maddison WP (1990). "A method for testing the correlated evolution of two binary characters: are gains or losses concentrated on certain branches of a phylogenetic tree?". Evolution. 44 (3): 539–557. doi:10.2307/2409434. JSTOR2409434. PMID28567979.
Maddison WP (1990). "A method for testing the correlated evolution of two binary characters: are gains or losses concentrated on certain branches of a phylogenetic tree?". Evolution. 44 (3): 539–557. doi:10.2307/2409434. JSTOR2409434. PMID28567979.