SZYMICZEK, Kazimierz. 2-ranks of class groups of Witt equivalent number fields. Annales Mathematicae Silesianae, [S. l.], v. 12, p. 53–64, 1998. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14163. Acesso em: 5 dec. 2025.