Leonid Gurvits Hyperbolic polynomials approach to Van der Waerden/Schrijver-Valiant like conjectures: sharper bounds, simpler proofs and algorithmic applications. 417-426 2006 conf/stoc/2006 STOC http://doi.acm.org/10.1145/1132516.1132578 db/conf/stoc/stoc2006.html#Gurvits06