Konstantin Andreev Charles Garrod Bruce M. Maggs Adam Meyerson 13-26 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3122&spage=13 2004 conf/approx/2004 APPROX-RANDOM db/conf/approx/approx2004.html#AndreevGMM04