R. Thirumalaisamy, S. Bala, T. Vijay, and K. Thirusangu. “SOME NEIGHBOURHOOD DEGREE BASED REACHABILITY ENERGY AND INDEX FOR REGULAR GRAPH”. Utilitas Mathematica, vol. 122, no. Special Issue-1, Aug. 2025, pp. 1362-8, https://utilitasmathematica.com/index.php/Index/article/view/2661.