Geodesic
On the $\alpha$-representation of Feynman integrals
Teoretičeskaâ i matematičeskaâ fizika, Tome 5 (1970) no. 3, pp. 356-365

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Graph theory is used to prove a formula for the integral over the internal momenta in the $\alpha$-representation of a Feynman integral. The distinctive feature of this formula is its explicit symmetry with respect to the choice of a tree in the graph. 
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     author = {B. M. Stepanov},
     title = {On the $\alpha$-representation of {Feynman} integrals},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1970_5_3_a3/}
}
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B. M. Stepanov. On the $\alpha$-representation of Feynman integrals. Teoretičeskaâ i matematičeskaâ fizika, Tome 5 (1970) no. 3, pp. 356-365. http://geodesic.mathdoc.fr/item/TMF_1970_5_3_a3/