Sparse sums of squares on finite abelian groups and improved semidefinite lifts.

Hamza Fawzi James Saunderson Pablo A. Parrilo Sparse sums of squares on finite abelian groups and improved semidefinite lifts. 149-191 2016 160 Math. Program. 1-2 https://doi.org/10.1007/s10107-015-0977-z db/journals/mp/mp160.html#FawziSP16