Lương Minh, Tuấn, Long Tạ Thành, Núi Dương xuân, Việt Đào Xuân, Đức Nguyễn Bá, and Kiên Nguyễn Đức Trung. “Helicity Modulus in a Q-State Clock Model”. SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY 6, no. 15 (April 16, 2021): 5–9. Accessed May 5, 2024. https://tckh.daihoctantrao.edu.vn/index.php/sjttu/article/view/351.