Remeijer, P., Steel, S. C., Jochemsen, R., Frossati, G., & Goodkind, J. M. (1997). On the properties of vacancies in solid 4 He as studied by pressure measurements. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, 23(5-6), 586–597. вилучено із https://fnt.ilt.kharkiv.ua/index.php/fnt/article/view/f23-0586e