Some Results on the Known Classes of Quadratic APN Functions. - Lilya Budaghyan; Tor Helleseth; Nian Li; Bo Sun 005 (IACR Cryptol. ePrint Arch., 2016)

On Upper Bounds for Algebraic Degrees of APN Functions. - Lilya Budaghyan; Claude Carlet; Tor Helleseth; Nian Li; Bo Sun 005 (IEEE Trans. Inf. Theory, 2018)