@article{AIHPA_1976__25_3_231_0,
     author = {Guerra, Francesco and Rosen, Lon and Simon, Barry},
     title = {Boundary conditions for the $P(\phi )_2$ euclidean field theory},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {231--334},
     publisher = {Gauthier-Villars},
     volume = {25},
     number = {3},
     year = {1976},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1976__25_3_231_0/}
}