%0 Journal Article
%A Hrubeš, Pavel
%A Wigderson, Avi
%A Yehudayoff, Amir
%T Non-commutative circuits and the sum-of-squares problem
%J Journal of the American Mathematical Society
%D 2011
%P 871-898
%V 24
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-2011-00694-2/
%R 10.1090/S0894-0347-2011-00694-2
%F 10_1090_S0894_0347_2011_00694_2