O. , Nyamsuren, and Ochirbat G. “Appendix II to the Paper Published Iu Transactions of Scientific Journal Physics, 2011 355(16) , Pages 133-138”. Scientific transaction of the National University of Mongolia. Physics 17, no. 362 (March 13, 2022): 225–230. Accessed April 6, 2025. https://journal.num.edu.mn/physics/article/view/735.