TY  - JOUR
AU  - Schmüdgen, Konrad
TI  - Around Hilbert's 17th problem
JO  - Documenta mathematica
PY  - 2012
SP  - 433
EP  - 438
VL  - Optimization Stories
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DOCMA_2012__S3__a3/
LA  - en
ID  - DOCMA_2012__S3__a3
ER  -