Vu BN, Ngo TC. Electronic Structure of Buckminsterfullerene C₆₀ and Absorption Spectra of the Cu₄²⁺@C₆₀ and Ag₄²⁺@ C₆₀ Clusters. The UPT Journal of Science. 2026;4(1):9-36. Accessed April 4, 2026. https://tapchikhoahocupt.vn/index.php/uptjs/article/view/122