![photo](http://phylnet.univ-mlv.fr/photos/PhotoFrancisAndrew.jpg) ![photo](http://phylnet.univ-mlv.fr/photos/PhotoSteelMike.jpg)
Andrew R. Francis and
Mike Steel. Which phylogenetic networks are merely trees with additional arcs? In Systematic Biology, Vol. 64(5):768-777, 2015. Keywords: explicit network, phylogenetic network, phylogeny, polynomial, tree-based network. Note: http://arxiv.org/abs/1502.07045.
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