ZVYAGIN, A. NMR relaxation rate of a quantum spin chain with an impurity: Магнетизм. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 38, n. 7, p. 808–815, 2012. DOI: 10.1063/1.4730977. Disponível em: http://80.92.230.95/index.php/fnt/article/view/f38-0808e. Acesso em: 20 чер. 2025.