no. 1
About poles of the resolvent, in a model for a harmonic oscillator coupled with massless scalar bosons
Annales de l'I.H.P. Physique théorique, Tome 68 (1998) no. 1, pp. 1-16 
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     author = {Billionnet, C.},
     title = {About poles of the resolvent, in a model for a harmonic oscillator coupled with massless scalar bosons},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {1--16},
     year = {1998},
     publisher = {Gauthier-Villars},
     volume = {68},
     number = {1},
     mrnumber = {1618914},
     zbl = {0907.34067},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1998__68_1_1_0/}
}
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Billionnet, C. About poles of the resolvent, in a model for a harmonic oscillator coupled with massless scalar bosons. Annales de l'I.H.P. Physique théorique, Tome 68 (1998) no. 1, pp. 1-16. https://www.numdam.org/item/AIHPA_1998__68_1_1_0/

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