Luong minh, T., Ta Thanh, L., Duong xuan, N., Dao Xuan, V., Nguyen Ba, Đuc, & Nguyen Duc Trung, K. (2021). Helicity modulus in a q-state clock model. SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY, 6(15), 5–9. https://doi.org/10.51453/2354-1431/2020/351