Shpenik, O. B., M. M. Erdevdy, P. P. Markush, J. E. Kontros, and I. V. Chernyshova. “Electron Impact Excitation and Ionization of Sulfur, Selenium, and Tellurium Vapors”. Ukrainian Journal of Physics 60, no. 3 (January 21, 2019): 217. Accessed April 18, 2024. https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2019257.