@incollection{JEDP_1985___2_A2_0,
     author = {Helffer, Bernard and Sj\"ostrand, Johannes},
     title = {Effet tunnel pour l'op\'erateur de {Schr\"odinger} semi-classique. {I}},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {2},
     pages = {1--38},
     publisher = {Ecole polytechnique},
     number = {2},
     year = {1985},
     language = {fr},
     url = {http://archive.numdam.org/item/JEDP_1985___2_A2_0/}
}