Geodesic
Description of $k$-bent functions in four variables
Diskretnyj analiz i issledovanie operacij, Tome 15 (2008) no. 4, pp. 74-83

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A simple description for the class of 2-bent functions in four variables is given. This class consists of 384 quadratic functions with 12 distinct types of quadratic part. Thus, all $k$-bent functions with at most four variables are classified. Bibl. 11.
Keywords: $k$-bent-functions, $k$-Walsh–Hadamard transform. 
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N. N. Tokareva. Description of $k$-bent functions in four variables. Diskretnyj analiz i issledovanie operacij, Tome 15 (2008) no. 4, pp. 74-83. http://geodesic.mathdoc.fr/item/DA_2008_15_4_a5/