On the phase diagram of a P(φ) 2 quantum field model
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 34 (1981) no. 2, pp. 173-229. 
@article{AIHPA_1981__34_2_173_0,
     author = {Summers, Stephen J.},
     title = {On the phase diagram of a $P (\phi )_2$ quantum field model},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {173--229},
     publisher = {Gauthier-Villars},
     volume = {34},
     number = {2},
     year = {1981},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1981__34_2_173_0/}
}
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Summers, Stephen J. On the phase diagram of a $P (\phi )_2$ quantum field model. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 34 (1981) no. 2, pp. 173-229. http://archive.numdam.org/item/AIHPA_1981__34_2_173_0/

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