Yuanyuan Jia, and Daoling Peng. “Density Functional Theory Study of the Secondorder Nonlinear Optical Properties of Novel Fluorenone Derivatives”. Japan Journal of Research 4, no. 3 (March 5, 2023): 1–10. Accessed September 22, 2024. https://journals.sciencexcel.com/index.php/jjr/article/view/426.