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 $2b|n$. 
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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/

[1] Tokareva N. N., “Gipotezy o chisle bent-funktsii”, Prikladnaya diskretnaya matematika. Prilozhenie, 2011, no. 4, 21–23

[2] Tokareva N., “On the number of bent functions from iterative constructions: lower bounds and hypotheses”, Adv. in Mathematics of Communications (AMC), 5:4 (2011), 609–621 | DOI | MR | Zbl

[3] Qu L., Li C., “Representing a Boolean function as the sum of two Bent functions”, Discrete Applied Mathematics, 2012 (to appear)