REMEIJER, P.; STEEL, S. C.; JOCHEMSEN, R.; FROSSATI, G.; GOODKIND, J. M. On the properties of vacancies in solid ⁴ He as studied by pressure measurements. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 23, n. 5-6, p. 586–597, 1997. Disponível em: http://fnt.ilt.kharkov.ua/index.php/fnt/article/view/f23-0586e. Acesso em: 22 груд. 2024.