@Article{HumphriesSemple2009,
AUTHOR = {Humphries, Peter J. and Semple, Charles},
TITLE = {Note on the hybridization number and subtree distance in phylogenetics},
YEAR = {2009},
JOURNAL = {Applied Mathematics Letters},
VOLUME = {22},
NUMBER = {4},
PAGES = {611-615},
URL = {http://dx.doi.org/10.1016/j.aml.2008.08.018},
NOTE = {
http://www.math.canterbury.ac.nz/~c.semple/papers/HS08.pdf},
KEYWORDS = {explicit network, minimum number, phylogenetic network, phylogeny, SPR distance}
}