TY  - JOUR
AU  - Ján Minác
AU  - Michel Spira
TI  - Formally real fields, pythagorean fields, C-fields and W-groups.
JO  - Mathematische Zeitschrift
PY  - 1990
SP  - 519
EP  - 530
VL  - 205
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1990__205_3_174192/
ID  - MZ_1990__205_3_174192
ER  -