%0 Journal Article %A Piotr Jaworski %T Quadratic field extensions and residue homomorphisms of Witt rings %J Acta Arithmetica %D 1993 %P 303-323 %V 64 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-64-4-303-323/ %R 10.4064/aa-64-4-303-323 %G en %F 10_4064_aa_64_4_303_323