%0 Journal Article
%A Ján Minác
%A Michel Spira
%T Formally real fields, pythagorean fields, C-fields and W-groups.
%J Mathematische Zeitschrift
%D 1990
%P 519-530
%V 205
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1990__205_3_174192/
%F MZ_1990__205_3_174192