Karakhanyan, M.I. “A REMARK ON SYMMETRIC $\beta$-UNIFORMLY CLOSED ALGEBRA”. Proceedings of the YSU A: Physical and Mathematical Sciences 49, no. 2 (237) (June 12, 2015): 21–25. Accessed May 19, 2024. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol49_no2_2015_pp021-025.