Konstantinos Georgiou Avner Magen Madhur Tulsiani Optimal Sherali-Adams Gaps from Pairwise Independence. 125-139 2009 APPROX-RANDOM http://dx.doi.org/10.1007/978-3-642-03685-9_10 conf/approx/2009 db/conf/approx/approx2009.html#GeorgiouMT09