Partially Ordered Group of the 2×2 Symmetric Matrices. InPrime: Indonesian Journal of Pure and Applied Mathematics, [S. l.], v. 1, n. 2, p. 122–127, 2019. DOI: 10.15408/inprime.v1i2.13701. Disponível em: https://journal.uinjkt.ac.id/inprime/article/view/13701. Acesso em: 22 dec. 2025.