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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     author = {Georgy P. Egorychev},
     title = {An integral representation and computation of multiple sum in the theory of cubature formulas},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
     pages = {363--369},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/JSFU_2012_5_3_a7/}
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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/