Polynomial bound on the distribution of poles in scattering by an obstacle
Journées équations aux dérivées partielles (1984), article no. 3, 8 p. 
@incollection{JEDP_1984____A3_0,
     author = {Melrose, Richard B.},
     title = {Polynomial bound on the distribution of poles in scattering by an obstacle},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {3},
     pages = {1--8},
     publisher = {Ecole polytechnique},
     year = {1984},
     zbl = {0621.35073},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1984____A3_0/}
}
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Melrose, Richard B. Polynomial bound on the distribution of poles in scattering by an obstacle. Journées équations aux dérivées partielles (1984), article  no. 3, 8 p. http://archive.numdam.org/item/JEDP_1984____A3_0/

[1] P.D. Lax & R.S. Phillips. Scattering theory, Academic Press. | Zbl

[2] R.B. Melrose. Polynomial bound for the poles in scattering by a potential. J. Funct. Anal (1984).