KOZIOŁ, Krzysztof; KULA, Mieczysław. Witt rings of infinite algebraic extensions of global fields. Annales Mathematicae Silesianae, [S. l.], v. 12, p. 131–139, 1998. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14170. Acesso em: 18 apr. 2025.