Dolgonos, G. A., E. S. Kryachko, and T. Yu. Nikolaienko. “On the Problem of He–He Bond in the Endohedral Fullerene He2@C60”. Ukrainian Journal of Physics 63, no. 4 (June 18, 2018): 288. Accessed April 16, 2024. https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018005.