ZVYAGIN, A. A. Commensurate-incommensurate phase transitions for multichain quantum spin models: exact results. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 26, n. 2, p. 181–196, 2000. DOI: 10.1063/1.593878. Disponível em: https://fnt.ilt.kharkov.ua/index.php/fnt/article/view/f26-0181e. Acesso em: 4 трав. 2024.