@misc{2003-fong-inversion ,note={URL: {\tt http://www.cacr.math.uwaterloo.ca/techreports/2003/tech\_reports2003.html}. Note: see also newer version $0} ,author={Kenny Fong and Darrel Hankerson and Julio L\'opez and Alfred Menezes} ,title={{Field inversion and point halving revisited}} ,year={2003} }