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MR2476821 (2009m:90098) 90C22 (05C10 05C85 65K05 68W25 90C10 90C27)
Hatami, Hamed; Magen, Avner; Markakis, Evangelos Integrality gaps of semidefinite programs for vertex cover and relations to $l\sb 1$ embeddability of negative type metrics. SIAM J. Discrete Math. 23 (2008/09), no. 1, 178–194.
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