CIEMAŁA, Marzena; SZYMICZEK, Kazimierz. On injectivity of natural homomorphisms of witt rings. Annales Mathematicae Silesianae, [S. l.], v. 21, p. 15–30, 2007. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14056. Acesso em: 18 dec. 2025.