Takao Asano An Improved Analysis of Goemans and Williamson's LP-Relaxation for MAX SAT. 2-14 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2751&spage=2 2003 conf/fct/2003 FCT db/conf/fct/fct2003.html#Asano03