SIDYGANOV, V. U.; KUPCHIKHIN, P. M. T-q diagram for the analysis of refrigerator circuits working on superfluid helium. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 16, n. 4, p. 465–467, 1990. Disponível em: http://80.92.230.95/index.php/fnt/article/view/f16-0465e. Acesso em: 11 лис. 2025.