Geodesic
Some properties of $q$-ary bent functions
Prikladnaya Diskretnaya Matematika. Supplement, no. 7 (2014), pp. 33-34.

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Let $F$ be a function from a finite field $Q$ to a finite field $P$. Here, both fields are of characteristic 2, $|P|=q\geq2$ and $Q$ is the expansion of the field $P$. The period of $F$ is defined as the period of the sequence $u(i)= F(\theta^i)$ ($\theta$ – primitive element of $Q$, $i\in\mathbb N_0$). Besides, let $N_a(F)$ be a number of solutions in $Q$ of equation $F(x)=a$, $a\in P$. Consider $F$ to be a bent function. In this case, it is shown that if the period of $F$ is not maximal one, then exact values of $N_a(F)$, $a\in P$, can be derived. Moreover, if values of $N_a(F)$, $a\in P$, are of a special form, then the value of the period of $F$ is divisible by some exact value.
Keywords: bent functions, period of a function, equations over finite fields. 
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     title = {Some properties of $q$-ary bent functions},
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V. A. Shishkin. Some properties of $q$-ary bent functions. Prikladnaya Diskretnaya Matematika. Supplement, no. 7 (2014), pp. 33-34. http://geodesic.mathdoc.fr/item/PDMA_2014_7_a12/

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