Robert Granger Andrew J. Holt Dan Page Nigel P. Smart Frederik Vercauteren Function Field Sieve in Characteristic Three. 223-234 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3076&spage=223 2004 conf/ants/2004 ANTS db/conf/ants/ants2004.html#GrangerHPSV04