Skrzypkowska, E., and Czesław Wowk. “Linkage and the Basic Part of Witt Rings”. Annales Mathematicae Silesianae 6 (September 30, 1992): 9–12. Accessed December 5, 2025. https://journals.us.edu.pl/index.php/AMSIL/article/view/14261.