Irreducible kernels and bound states in λ𝒫(ϕ) 2 models
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 31 (1979) no. 3, pp. 173-234. 
@article{AIHPA_1979__31_3_173_0,
     author = {Koch, Hans},
     title = {Irreducible kernels and bound states in $\lambda \mathcal {P}(\varphi )_2$ models},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {173--234},
     publisher = {Gauthier-Villars},
     volume = {31},
     number = {3},
     year = {1979},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1979__31_3_173_0/}
}
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Koch, Hans. Irreducible kernels and bound states in $\lambda \mathcal {P}(\varphi )_2$ models. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 31 (1979) no. 3, pp. 173-234. http://www.numdam.org/item/AIHPA_1979__31_3_173_0/

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