ZHANG, Y.; HEIDEN С. Performance studies on bulk YBa₂Cu₃O_7-y rf-SQUIDs. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 16, n. 5, p. 593–594, 1990. Disponível em: http://80.92.230.95/index.php/fnt/article/view/f16-0593e. Acesso em: 11 лис. 2025.