Marcolli, Matilde Max Planck Institute for Mathematics, Max Planck Society;
Zainy al-Yasry, Ahmad Max Planck Institute for Mathematics, Max Planck Society;
Marcolli, M., & Zainy al-Yasry, A. (2008). Coverings, correspondences, and noncommutative geometry. Journal of Geometry and Physics, 58(12), 1639-1661. doi:10.1016/j.geomphys.2008.07.007.