Yun S. Song. A Concise Necessary and Sufficient Condition for the Existence of a Galled-Tree. In TCBB, Vol. 3(2):186-191, 2006. Keywords: characterization, from sequences, galled tree, phylogenetic network, phylogeny, polynomial, reconstruction. Note: http://www.eecs.berkeley.edu/~yss/Pub/nasc4gall.pdf.
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