V. DURAI MURUGAN; R. SEETHALAKSHMI; P. NAMASIVAYAM. The Lattice Structure of the Subgroups of Order 42 and 48 in the Subgroup Lattices of $2 \times 2$ Matrices Over $Z_{7}$. International Journal of Mathematics And its Applications, [S. l.], v. 8, n. 3, p. 141–146, 2020. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/138. Acesso em: 19 may. 2024.