On the classification of APN functions up to dimension five.

Marcus Brinkmann Gregor Leander On the classification of APN functions up to dimension five. 273-288 2008 49 Des. Codes Cryptography 1-3 http://dx.doi.org/10.1007/s10623-008-9194-6 db/journals/dcc/dcc49.html#BrinkmannL08