“Two-Dimensional Spin-1 2 J1 − J′1 − J2 Heisenberg Model Within Jordan–Wigner Transformation”. Ukrainian Journal of Physics 61, no. 7 (January 5, 2019): 597. Accessed September 10, 2026. https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2019062.