Azami, Shahroud, and Asadollah Razavi. “Eigenvalue Variations of Heisenberg and Quaternion Lie Groups Under the Ricci Flow”. Eurasian Mathematical Journal 9, no. 1 (May 26, 2024). Accessed October 5, 2024. https://emj.enu.kz/index.php/main/article/view/108.