W. I. Skrypnik, “Long-range order in linear ferromagnetic oscillator systems. Strong pair quadratic n-n potential”, Ukr. Mat. Zhurn., vol. 56, no. 6, pp. 810–817, Jun. 2004, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3800