KLEPIKOV, V. F. Modulation structures and phase transitions. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 17, n. 9, p. 1166–1170, 1991. Disponível em: http://80.92.230.95/index.php/fnt/article/view/f17-1166e. Acesso em: 18 квіт. 2026.