Hans de Nivelle Translation of Resolution Proofs into Short First-Order Proofs without Choice Axioms. 365-379 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2741&spage=365 2003 conf/cade/2003 CADE db/conf/cade/cade2003.html#Nivelle03