Geodesic
Approximate formulas for functional integrals including the contributions of Feynman diagrams of given form
Matematičeskoe modelirovanie, Tome 9 (1997) no. 1, pp. 69-78 Cet article a éte moissonné depuis la source Math-Net.Ru

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Approximate method for evaluation of functional integrals is developed, taking into consideration the contributions of special form Feynman diagrams. Concrete formulas are obtained using small parameter and connected diagrams. The formulas of the general form for integrals on Poisson measure are constructed. 
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     author = {A. D. Egorov and E. P. Zhidkov and V. A. Petrov},
     title = {Approximate formulas for functional integrals including the contributions of {Feynman} diagrams of given form},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {69--78},
     year = {1997},
     volume = {9},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_1997_9_1_a5/}
}
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A. D. Egorov; E. P. Zhidkov; V. A. Petrov. Approximate formulas for functional integrals including the contributions of Feynman diagrams of given form. Matematičeskoe modelirovanie, Tome 9 (1997) no. 1, pp. 69-78. http://geodesic.mathdoc.fr/item/MM_1997_9_1_a5/