@article{JEMS_2018_20_2_a4,
     author = {Michael Hitrik and Johannes Sj\"ostrand},
     title = {Rational invariant tori and band edge spectra for non-selfadjoint operators},
     journal = {Journal of the European Mathematical Society},
     pages = {391--457},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2018},
     doi = {10.4171/jems/770},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/770/}
}