SYRKIN, E. S.; FEODOS`EV, S. B. Peculiar features of phonon spectra of HTSC maltilayered crystal structures. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 17, n. 9, p. 1055–1058, 1991. Disponível em: http://80.92.230.95/index.php/fnt/article/view/f17-1055e. Acesso em: 20 чер. 2025.