BENFATTO, L.; SHARAPOV, S. Optical-conductivity sum rule in cuprates and unconventional charge density waves: a short review. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 32, n. 6, p. 700–715, 2006. DOI: 10.1063/1.2215368. Disponível em: https://fnt.ilt.kharkov.ua/index.php/fnt/article/view/f32-0700e. Acesso em: 13 квіт. 2024.