Christophe Ritzenthaler Point Counting on Genus 3 Non Hyperelliptic Curves. 379-394 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3076&spage=379 2004 conf/ants/2004 ANTS db/conf/ants/ants2004.html#Ritzenthaler04