@article{2004-fong-inversion ,note={Note: see also older version $0} ,author={Kenny Fong and Darrel Hankerson and Julio L\'opez and Alfred Menezes} ,ISSN={0018--9340} ,journal={IEEE Transactions on Computers} ,pages={1047--1059} ,title={{Field inversion and point halving revisited}} ,volume={53} ,year={2004} }