MALOMED, B. A. . A new topic in the studies of topological solitons: Topologically protected higher-order modes in fractal optical systems. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 51, n. 6, p. 744–750, 2025. Disponível em: https://fnt.ilt.kharkov.ua/index.php/fnt/article/view/9478. Acesso em: 25 квіт. 2025.