Some Improvements to 4-Descent on an Elliptic Curve.

Tom Fisher Some Improvements to 4-Descent on an Elliptic Curve. 125-138 2008 ANTS http://dx.doi.org/10.1007/978-3-540-79456-1_8 conf/ants/2008 db/conf/ants/ants2008.html#Fisher08