FERRELL, R. A.; BHATTACHARJEE, J. K. Lambda point thermodynamics of confined liquid helium: negative surface specific heat. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 24, n. 2, p. 104–108, 1998. DOI: 10.1063/1.593540. Disponível em: http://80.92.230.95/index.php/fnt/article/view/f24-0104e. Acesso em: 11 лис. 2025.