2 citations to https://www.mathnet.ru/rus/adm76

1. A. Dudko, R. Grigorchuk, “On spectra of Koopman, groupoid and quasi-regular representations”, J. Mod. Dyn., 11 (2017), 99–123        
2. A. Dudko, R. Grigorchuk, “On irreducibility and disjointness of Koopman and quasi-regular representations of weakly branch groups”, Modern Theory of Dynamical Systems: a Tribute to Dmitry Victorovich Anosov, Contemporary Mathematics, 692, eds. A. Katok, Y. Pesin, F. Hertz, Amer. Math. Soc., 2017, 51–66