@article{AIHPA_1991__55_1_459_0,
     author = {Klopp, Fr\'ed\'eric},
     title = {\'Etude semi-classique d'une perturbation d'un op\'erateur de {Schr\"odinger} p\'eriodique},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {459--509},
     publisher = {Gauthier-Villars},
     volume = {55},
     number = {1},
     year = {1991},
     mrnumber = {1130214},
     zbl = {0754.35100},
     language = {fr},
     url = {http://www.numdam.org/item/AIHPA_1991__55_1_459_0/}
}