@book{MSMF_1990_2_40__1_0,
     author = {Helffer, B. and Sj\"ostrand, J.},
     title = {Analyse semi-classique pour l'\'equation de {Harper.} {II} : comportement semi-classique pr\`es d'un rationnel},
     series = {M\'emoires de la Soci\'et\'e Math\'ematique de France},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {40},
     year = {1990},
     doi = {10.24033/msmf.347},
     zbl = {0714.34131},
     language = {fr},
     url = {http://archive.numdam.org/item/MSMF_1990_2_40__1_0/}
}