Research outputs J. Brodzki, S.J. Campbell, E. Guentner, G.A. Niblo & N.J. Wright, 2009, Journal of Functional Analysis, 256(5), 1408-1431 DOI: Type: article 2009, Journal of Functional Analysis, 256(2), 409-431 DOI: Type: article 2006, Bulletin of the London Mathematical Society, 38(3), 441-446 DOI: Type: article