no. 4
On an inverse problem in potential scattering theory
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 8 (1968) no. 4, pp. 339-447 
@article{AIHPA_1968__8_4_339_0,
     author = {Loeffel, Jean-Jacques},
     title = {On an inverse problem in potential scattering theory},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {339--447},
     year = {1968},
     publisher = {Gauthier-Villars},
     volume = {8},
     number = {4},
     mrnumber = {237152},
     zbl = {0159.59804},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1968__8_4_339_0/}
}
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Loeffel, Jean-Jacques. On an inverse problem in potential scattering theory. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 8 (1968) no. 4, pp. 339-447. https://www.numdam.org/item/AIHPA_1968__8_4_339_0/