%0 Journal Article %A Hans Heilbronn %T On real characters %J Acta Arithmetica %D 1936 %P 212-213 %V 2 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-2-2-212-213/ %R 10.4064/aa-2-2-212-213 %G en %F 10_4064_aa_2_2_212_213