SKRYPNIK, W. I. Long-range order in linear ferromagnetic oscillator systems. Strong pair quadratic n-n potential. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 6, p. 810–817, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3800. Acesso em: 5 dec. 2025.