urRF is a new measure based on the standard RF (Robinson-Foulds) distance to compare an unrooted tree with a rooted tree, and describe a linear time algorithm to compute urRF.
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Paweł Górecki, Oliver Eulenstein
A Robinson-Foulds measure to compare unrooted trees with rooted trees
Bioinformatics Research and Applications Lecture Notes in Computer Science Volume 7292, 2012, pp 115-126