Shpenik, O., A. Zavilopulo, E. Remeta, S. Demes, and M. Erdevdy. “Inelastic Processes of Electron Interaction With Chalcogens in the Gaseous Phase (a Review)”. Ukrainian Journal of Physics 65, no. 7 (July 15, 2020): 557. Accessed August 15, 2020. https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2019589.