@article{10_4171_ggd_91,
     author = {Andrew M. Brunner and Said N. Sidki},
     title = {Abelian state-closed subgroups of automorphisms of $m$-ary trees},
     journal = {Groups, geometry, and dynamics},
     pages = {455--472},
     year = {2010},
     volume = {4},
     number = {3},
     doi = {10.4171/ggd/91},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/91/}
}