by Franz Lehner and Stephan Wagner
Reference:
Franz Lehner and Stephan Wagner, Free lamplighter groups and a question of Atiyah, American Journal of Mathematics, 135(3), 835-849, (2013).
Bibtex Entry:
@Article{LehnerWagner2013,
arxiv = {1005.2347},
author = {Franz Lehner and Stephan Wagner},
journal = {American Journal of Mathematics},
title = {Free lamplighter groups and a question of {A}tiyah},
year = {2013},
number = {3},
pages = {835-849},
volume = {135},
doi = {10.1353/ajm.2013.0029},
groups = {Project01 (Woess), Faculty, External},
xxmrnumber = {3068404},
}