Geodesic
Convergence of~Feynman diagram expansions in~the~Ising model
Teoretičeskaâ i matematičeskaâ fizika, Tome 30 (1977) no. 1, pp. 138-141

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Estimates for vertex factors of the Feynman graphs in the Ising model are obtained. These estimates demonstrate the existence of some simple divergent subsequences of diagrams. 
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     author = {N. M. Bogolyubov},
     title = {Convergence {of~Feynman} diagram expansions {in~the~Ising} model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {138--141},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1977_30_1_a15/}
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N. M. Bogolyubov. Convergence of~Feynman diagram expansions in~the~Ising model. Teoretičeskaâ i matematičeskaâ fizika, Tome 30 (1977) no. 1, pp. 138-141. http://geodesic.mathdoc.fr/item/TMF_1977_30_1_a15/