Joachim von zur Gathen Amin Shokrollahi Jamshid Shokrollahi Efficient Multiplication Using Type 2 Optimal Normal Bases. 55-68 2007 conf/waifi/2007 WAIFI http://dx.doi.org/10.1007/978-3-540-73074-3_6 db/conf/waifi/waifi2007.html#GathenSS07