ARNOLDI, JEAN FRANCOIS, FRÉDÉRIC FAURE, and Tobias Weich. “Asymptotic Spectral Gap and Weyl Law for Ruelle Resonances of Open Partially Expanding Maps.”https://doi.org/10.1017/etds.2015.34__Ergodic Theory and Dynamical Systems 37, no. 1 (2015): 1–58.https://doi.org/10.1017/etds.2015.34 .