Geodesic
Strong coupling limit for $O(N)\varphi^4$-interaction
Teoretičeskaâ i matematičeskaâ fizika, Tome 29 (1976) no. 2, pp. 147-153

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For the $O(N)\varphi^4$ model, a diagram technique is constructed for the $1/N$-expansion of the Green's functions. It is shown that in every order in the $1/N$ expansion one can go to the strong coupling limit, which, in particular, makes it possible to prove renormalizability of the chiral field in three dimensional spacetime. 
@article{TMF_1976_29_2_a0,
     author = {I. Ya. Aref'eva},
     title = {Strong coupling limit for $O(N)\varphi^4$-interaction},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {147--153},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1976_29_2_a0/}
}
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I. Ya. Aref'eva. Strong coupling limit for $O(N)\varphi^4$-interaction. Teoretičeskaâ i matematičeskaâ fizika, Tome 29 (1976) no. 2, pp. 147-153. http://geodesic.mathdoc.fr/item/TMF_1976_29_2_a0/