HOFMANN, A. Critical velocity of superfluied helinm flow in narrow pore filters. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 16, n. 5, p. 538–541, 1990. Disponível em: http://80.92.230.95/index.php/fnt/article/view/f16-0538e. Acesso em: 20 чер. 2025.