Geodesic
Representation for Ursell functions and cluster estimates
Teoretičeskaâ i matematičeskaâ fizika, Tome 39 (1979) no. 1, pp. 94-105

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A new representation is derived for the Ursell functions. This representation is used, in particular, to improve the already known estimates of the Ursell functions, the estimates of the convergence radius of the Mayer expansion, and to derive cluster estimates of the cluster functions (cf [1–5]). 
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     author = {A. G. Basuev},
     title = {Representation for {Ursell} functions and cluster estimates},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1979_39_1_a9/}
}
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A. G. Basuev. Representation for Ursell functions and cluster estimates. Teoretičeskaâ i matematičeskaâ fizika, Tome 39 (1979) no. 1, pp. 94-105. http://geodesic.mathdoc.fr/item/TMF_1979_39_1_a9/