no. 2
On the mass spectrum of Higgs particles
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 32 (1980) no. 2, pp. 161-173. 
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     author = {von Westenholz, C.},
     title = {On the mass spectrum of {Higgs} particles},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {161--173},
     publisher = {Gauthier-Villars},
     volume = {32},
     number = {2},
     year = {1980},
     mrnumber = {580325},
     zbl = {0432.58009},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1980__32_2_161_0/}
}
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von Westenholz, C. On the mass spectrum of Higgs particles. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 32 (1980) no. 2, pp. 161-173. http://www.numdam.org/item/AIHPA_1980__32_2_161_0/

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[4] E. Kreyszig, Differentialgeometrie, Akademische Verlagsgesellschaft, Geest and Portig, Leipzig, 1957. | MR | Zbl

[5] C. Von Westenholz, Ann. Inst. H. Poincaré, XXIX, t. 3, 1978, p. 285-303. | Numdam | MR | Zbl