@incollection{JEDP_1986____A10_0,
     author = {Sj\"ostrand, Johannes},
     title = {Semiclassical resonances in some simple cases},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {10},
     pages = {1--12},
     publisher = {Ecole polytechnique},
     year = {1986},
     zbl = {0609.35069},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1986____A10_0/}
}