1. Case, J., Jain, S., Seah, S., Stephan, F.: Automatic functions, linear time and learning. In: How the World Computes - Turing Centenary Conference and Eighth Conference on Computability in Europe, CiE 2012, Cambridge, UK, June 18–23, 2012. Proceedings. Springer LNCS, vol. 7318, pp 96–106 (2012)
2. Cobham, A.: On the base-dependence of sets of numbers recognizable by finite automata. Mathematical Systems Theory 3, 186–192 (1969)
3. Delhommé, C.: Automaticité des ordinaux et des graphes homogènes. Comptes Rendus Mathematique 339(1), 5–10 (2004)
4. Epstein, D.B.A., Cannon, J.W., Holt, D.F., Levy, S.V.F., Paterson, M.S., Thurston, W.P.: Word Processing in Groups. Jones and Bartlett Publishers, Boston (1992)
5. Fuchs, L.: Partially Ordered Algebraic Systems. Pergamon Press (1963)