@article{AIHPA_1998__68_2_139_0,
     author = {Karner, Gunther},
     title = {On quantum twist maps and spectral properties of {Floquet} operators},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {139--157},
     publisher = {Gauthier-Villars},
     volume = {68},
     number = {2},
     year = {1998},
     mrnumber = {1618660},
     zbl = {0902.58036},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1998__68_2_139_0/}
}