@article{AIHPA_1986__44_4_427_0,
     author = {Feldman, Joel and Rivasseau, Vincent},
     title = {Existence of an instanton singularity in $\phi ^4_{\;3}$. {Euclidean} field theory},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {427--442},
     publisher = {Gauthier-Villars},
     volume = {44},
     number = {4},
     year = {1986},
     zbl = {0606.41044},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1986__44_4_427_0/}
}