Volker W. THÜREY. The Klein Four-Group: A Brief Mathematical Approach. Current Topics on Mathematics and Computer Science Vol. 11, [S. l.], p. 66–68, 2021. DOI: 10.9734/bpi/ctmcs/v11/4179F. Disponível em: https://stm.bookpi.org/CTMCS-V11/article/view/3980. Acesso em: 4 jun. 2026.