WEISSAUER, Rainer. The Witt group of quadratic characters. MATHEMATICA SCANDINAVICA, [S. l.], v. 59, p. 71–92, 1986. DOI: 10.7146/math.scand.a-12155. Disponível em: https://tidsskrift.dk/math/article/view/12155. Acesso em: 14 aug. 2026.