Hoàng, Vũ Huy, and Đặng Văn Chuyết. “Some Properties of the Set T(e), a Special Subset of Z”. Journal of Computer Science and Cybernetics 25, no. 2 (April 27, 2012): 159–165. Accessed May 4, 2024. https://vjs.ac.vn/index.php/jcc/article/view/573.