1. G. Amir, O. Angel, B. Virag, Amenability of linear-activity automaton groups, J. Eur. Math. Soc., available at http://arxiv.org/abs/0905.2007 (in press).
2. On the spectrum of Hecke type operators related to some fractal groups;Bartholdi;Tr. Mat. Inst. Steklova,2000
3. From fractal groups to fractal sets;Bartholdi,2003
4. ω-periodic graphs;Benjamini;Electron. J. Combin.,2005
5. I. Bondarenko, Groups generated by bounded automata and their Schreier graphs. Ph.D. Dissertation, Texas A&M University, 2007, 154 pp.