STEINER, P.; KARPINSKI, J.; WACHTER, P. I-Vcharacteristics of point contacts on untwinned high-T_c material YBa₂Cu₄O₈. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 18, n. 6, p. 570–573, 1992. Disponível em: http://80.92.230.95/index.php/fnt/article/view/f18-0570e. Acesso em: 11 лис. 2025.