Max-leaves spanning tree is APX-hard for cubic graphs. Bonsma, P. S. J. Discrete Algorithms (JDA), 12:14-23, 2012.
Paper bibtex @article{ dblp2265580,
title = {Max-leaves spanning tree is APX-hard for cubic graphs},
author = {Paul S. Bonsma},
author_short = {Bonsma, P. S.},
bibtype = {article},
type = {article},
year = {2012},
key = {dblp2265580},
id = {dblp2265580},
biburl = {http://www.dblp.org/rec/bibtex/journals/jda/Bonsma12},
url = {http://dx.doi.org/10.1016/j.jda.2011.06.005},
journal = {J. Discrete Algorithms (JDA)},
pages = {14-23},
volume = {12},
text = {J. Discrete Algorithms (JDA) 12:14-23 (2012)}
}
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