1. Archbold, R.J., Spielberg, J. S.: Topologically free actions and ideals in descrete C*-dynamical systems. Proc. Edinb. Math. Soc. (2) 37(1), 119–124 (1994)
2. Carlsen, T.M., Silvestrov, S.: On the Exel crossed product of topological covering maps. Acta Appl. Math. 108(3), 573–583 (2009)
3. de Jeu, M., Svensson, C., Tomiyama, J.: On the Banach *-algebra crossed product associated with a topological dynamical system. J. Funct. Anal. 262(11), 4746–4765 (2012)
4. Dutkay, D.E., Jorgensen, P.E.T., Silvestrov, S.: Decomposition of wavelet representations and Martin boundaries. J. Funct. Anal. 262(3), 1043–1061 (2012)
5. Dutkay, D.E., Jorgensen, P.E.T.: Martingales, endomorphisms and covariant systems of operators in Hilbert space. J. Oper. Theory Anal. 58(2), 269–310 (2007)