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

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