Nakhodkin, M. G., and M. I. Fedorchenko. “Photoelectron Emission from Si–Gd–O Cathode”. Ukrainian Journal of Physics 61, no. 3 (January 6, 2019): 248. Accessed April 24, 2024. https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2019106.