Polynomial Integrality gaps for strong SDP relaxations of Densest $k$-subgraph. Bhaskara, A., Charikar, M., Guruswami, V., Vijayaraghavan, A., & Zhou, Y. In SODA, 2012.
bibtex   
@inproceedings{BCGVZ,
  author    = {Aditya Bhaskara and Moses Charikar and Venkatesan Guruswami and
               Aravindan Vijayaraghavan and Yuan Zhou},
  title     = {Polynomial Integrality gaps for strong {SDP} relaxations of Densest $k$-subgraph},
  booktitle = {SODA},	
  year = {2012}
}

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