Grippo, Luigi, Laura Palagi, Mauro Piacentini, and Veronica Piccialli. 2009. “An Unconstrained Approach for Solving Low Rank SDP Relaxations of {-1, 1} Quadratic Problems”. Department of Computer and System Sciences Antonio Ruberti Technical Reports 1 (13). https://rosa.uniroma1.it/rosa00/index.php/dis_technical_reports/article/view/8856.