Geodesic
An integral representation and computation of multiple sum in the theory of cubature formulas
Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 5 (2012) no. 3, pp. 363-369.

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In this article is a finding new simple proof of hard identity from theory of cubature formulas by means of the method of coefficients.
Keywords: combinatorial sums, integral representation, cubature formulas. 
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Georgy P. Egorychev. An integral representation and computation of multiple sum in the theory of cubature formulas. Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 5 (2012) no. 3, pp. 363-369. http://geodesic.mathdoc.fr/item/JSFU_2012_5_3_a7/

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