Dehgardi, N., S.M. Sheikholeslami, and M. Soroudi. “Some Distance Based Indices of Graphs Based on Four New Operations Related to the Lexicographic Product”. Carpathian Mathematical Publications 11, no. 2 (December 31, 2019): 258–267. Accessed May 19, 2024. https://journals.pnu.edu.ua/index.php/cmp/article/view/2106.