Li, Yalan, Bo Deng, and Chengfu Ye. “New Relationship Between Energy and Estrada Index”. Discontinuity, Nonlinearity, and Complexity 10, no. 4 (December 1, 2021): 617–623. Accessed October 17, 2026. https://lhscientificpublishing.com/index.php/DNC/article/view/1742.