@article{10_4171_ggd_222,
     author = {David McCune},
     title = {Semigroups arising from asynchronous automata},
     journal = {Groups, geometry, and dynamics},
     pages = {199--223},
     year = {2014},
     volume = {8},
     number = {1},
     doi = {10.4171/ggd/222},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/222/}
}