Bogopolski, Oleg Max Planck Institute for Mathematics, Max Planck Society;
https://doi.org/10.1016/j.topol.2011.10.003 (Publisher version)
Bogopolski, O., & Zastrow, A. (2012). The word problem for some uncountable groups given by countable words. Topology and its Applications, 159(3), 569-586. doi:10.1016/j.topol.2011.10.003.