On Systems of Linear Equations with Two Variables per Equation.

Uriel Feige Daniel Reichman On Systems of Linear Equations with Two Variables per Equation. 117-127 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3122&spage=117 2004 conf/approx/2004 APPROX-RANDOM db/conf/approx/approx2004.html#FeigeR04