V. Venkateswara Rao, P. L. N. Varma, Reddy Babu D., Y. Srinivasa Rao. 2020. “D-Antipodal and Detour D-Antipodal Graphs”. International Journal of Advanced Science and Technology 29 (08), 2371 -81. https://sersc.org/journals/index.php/IJAST/article/view/23406.