no. 2
Spectral properties of one-body relativistic spin-zero hamiltonians
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 20 (1974) no. 2, pp. 211-220 
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     author = {Weder, R. A.},
     title = {Spectral properties of one-body relativistic spin-zero hamiltonians},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {211--220},
     year = {1974},
     publisher = {Gauthier-Villars},
     volume = {20},
     number = {2},
     mrnumber = {351332},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1974__20_2_211_0/}
}
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Weder, R. A. Spectral properties of one-body relativistic spin-zero hamiltonians. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 20 (1974) no. 2, pp. 211-220. https://www.numdam.org/item/AIHPA_1974__20_2_211_0/

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