@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/} }