Maria Christopoulou Theodoulos Garefalakis Daniel Panario David Thomson The trace of an optimal normal element and low complexity normal bases. 199-215 2008 49 Des. Codes Cryptography 1-3 http://dx.doi.org/10.1007/s10623-008-9195-5 db/journals/dcc/dcc49.html#ChristopoulouGPT08