no. 3
Perturbation theory for Schrödinger operators with complex potentials
Annales de l'I.H.P. Physique théorique, Tome 42 (1985) no. 3, pp. 235-251. 
@article{AIHPA_1985__42_3_235_0,
     author = {Caliceti, Emanuela},
     title = {Perturbation theory for {Schr\"odinger} operators with complex potentials},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {235--251},
     publisher = {Gauthier-Villars},
     volume = {42},
     number = {3},
     year = {1985},
     mrnumber = {797274},
     zbl = {0595.47024},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1985__42_3_235_0/}
}
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Caliceti, Emanuela. Perturbation theory for Schrödinger operators with complex potentials. Annales de l'I.H.P. Physique théorique, Tome 42 (1985) no. 3, pp. 235-251. http://www.numdam.org/item/AIHPA_1985__42_3_235_0/

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