@phdthesis{BJHTUP11_1990__0268__P0_0,
     author = {Klopp, Fr\'ed\'eric},
     title = {\'Etude semi-classique d'une perturbation d'un op\'erateur de {Schr\"odinger} p\'eriodique},
     series = {Th\`eses d'Orsay},
     publisher = {Universit\'e de Paris-Sud Centre d'Orsay},
     number = {268},
     year = {1990},
     language = {fr},
     url = {http://archive.numdam.org/item/BJHTUP11_1990__0268__P0_0/}
}