Charles Semple and
Jack Simpson. When is a phylogenetic network simply an amalgamation of two trees? In BMB, Vol. 80(9):2338-2348, 2018. Keywords: characterization, phylogenetic network, phylogeny, reticulation-visible network, stack-free network, tree-based network. Note: http://www.math.canterbury.ac.nz/~c.semple/papers/SS18.pdf.
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