V. Durai Murugan, R. Seethalakshmi and P. Namasivayam (2020) “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, 8(3), pp. 141–146. Available at: http://ijmaa.in/index.php/ijmaa/article/view/138 (Accessed: 19 May 2024).