YUCAS, Joseph L. Linkage and the basic part of Witt rings. Annales Mathematicae Silesianae, [S. l.], v. 5, p. 7–9, 1991. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14274. Acesso em: 18 apr. 2025.