Geodesic
On decomposition of a~Boolean function into sum of bent functions
Prikladnaya Diskretnaya Matematika. Supplement, no. 5 (2012)

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In the paper, some new results on bent sum decomposition problem are discussed. It is proved that any Boolean function in $n$ variables of degree $d\leq n/2$ can be represented as the sum of not more than $2{2b\choose b}$ bent functions, where $b\geq d$ and $b$ is the least integer such that $2b|n$. 
@article{PDMA_2012_5_a14,
     author = {N. N. Tokareva},
     title = {On decomposition of {a~Boolean} function into sum of bent functions},
     journal = {Prikladnaya Diskretnaya Matematika. Supplement},
     pages = {30},
     publisher = {mathdoc},
     number = {5},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDMA_2012_5_a14/}
}
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N. N. Tokareva. On decomposition of a~Boolean function into sum of bent functions. Prikladnaya Diskretnaya Matematika. Supplement, no. 5 (2012). http://geodesic.mathdoc.fr/item/PDMA_2012_5_a14/