%0 Journal Article
%A Hoffmann, Detlev
%T Pythagoras numbers of fields
%J Journal of the American Mathematical Society
%D 1999
%P 839-848
%V 12
%N 3
%U http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-99-00301-X/
%R 10.1090/S0894-0347-99-00301-X
%F 10_1090_S0894_0347_99_00301_X