@article{SEDP_1987-1988____A12_0,
     author = {Helffer, B. and Sj\"ostrand, J.},
     title = {Structure cantorienne du spectre de l'op\'erateur de {Harper}},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:12},
     pages = {1--6},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1987-1988},
     mrnumber = {1018184},
     zbl = {0666.34012},
     language = {fr},
     url = {http://archive.numdam.org/item/SEDP_1987-1988____A12_0/}
}