Roberto Maria Avanzi Mathieu Ciet Francesco Sica Faster Scalar Multiplication on Koblitz Curves Combining Point Halving with the Frobenius Endomorphism. 28-40 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2947&spage=28 2004 conf/pkc/2004 Public Key Cryptography db/conf/pkc/pkc2004.html#AvanziCS04