TY  - JOUR
AU  - Blekherman, Grigoriy
TI  - Nonnegative polynomials and sums of squares
JO  - Journal of the American Mathematical Society
PY  - 2012
SP  - 617
EP  - 635
VL  - 25
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-2012-00733-4/
DO  - 10.1090/S0894-0347-2012-00733-4
ID  - 10_1090_S0894_0347_2012_00733_4
ER  -