Guohua Jin,
Luay Nakhleh,
Sagi Snir and
Tamir Tuller. Parsimony Score of Phylogenetic Networks: Hardness Results and a Linear-time Heuristic. In TCBB, Vol. 6(3):495-505, 2009. Keywords: explicit network, heuristic, parsimony, phylogenetic network, phylogeny, reconstruction. Note: http://www.cs.rice.edu/~nakhleh/Papers/tcbb-MP.pdf.
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