A perturbation theory of resonances
Journées équations aux dérivées partielles (1996), article no. 1, 11 p. 
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     author = {Agmon, Shmuel},
     title = {A perturbation theory of resonances},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {1},
     pages = {1--11},
     publisher = {Ecole polytechnique},
     year = {1996},
     zbl = {0902.47007},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1996____A1_0/}
}
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Agmon, Shmuel. A perturbation theory of resonances. Journées équations aux dérivées partielles (1996), article  no. 1, 11 p. http://archive.numdam.org/item/JEDP_1996____A1_0/

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