SKRYPNIK, W. I. On Polymer Expansions for Equilibrium Systems of Oscillators with Ternary Interaction. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 11, p. 1532–1544, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4373. Acesso em: 6 dec. 2025.