RICHTER, J. Localized-magnon states in strongly frustrated quantum spin lattices. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 31, n. 8-9, p. 918–928, 2005. Disponível em: http://80.92.230.95/index.php/fnt/article/view/f31-0918e. Acesso em: 11 лис. 2025.