Khachatryan, I. G. “ON PARADOXES OF INTUITIVE THEORY OF SETS”. Proceedings of the YSU A: Physical and Mathematical Sciences 40, no. 3 (211) (October 27, 2006): 139–141. Accessed July 3, 2024. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol40_no3_2006_pp139-141.