Luay Nakhleh,
Don Ringe and
Tandy Warnow. Perfect Phylogenetic Networks: A New Methodology for Reconstructing the Evolutionary History of Natural Languages. In Language, Journal of the Linguistic Society of America, Vol. 81(2):382-420, 2002. Keywords: perfect, phylogenetic network, phylogeny. Note: http://www.cs.rice.edu/~nakhleh/Papers/81.2nakhleh.pdf.
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