Litvinov, V., I. Okseniuk, D. Shevchenko, and V. Bobkov. “SIMS Study of the Surface of Lanthanum-Based Alloys”. Ukrainian Journal of Physics 62, no. 10 (December 12, 2018): 845. Accessed July 6, 2020. https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018618.