@Article{	  DAngeliRW2017,
  title		= "On the complexity of the word problem for automaton
		  semigroups and automaton groups",
  journal	= "Advances in Applied Mathematics",
  volume	= "90",
  number	= "",
  pages		= "160 - 187",
  year		= "2017",
  issn		= "0196-8858",
  doi		= "10.1016/j.aam.2017.05.008",
  url		= "http://dx.doi.org/10.1016/j.aam.2017.05.008",
  eprint	= "http://www.sciencedirect.com/science/article/pii/S0196885817300775",
  author	= "Daniele D'Angeli and Emanuele Rodaro and W{\"a}chter, Jan
		  Philipp",
  keywords	= "Word problem"
}