TY  - JOUR
AU  - C.N. Delzell
TI  - A continuous, constructive solution to Hilbert's 17th problem.
JO  - Inventiones mathematicae
PY  - 1984
SP  - 365
EP  - 384
VL  - 76
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1984__76_143128/
ID  - IM_1984__76_143128
ER  -