GUTOWSKI, H.; NIENABER, U.; SANDTNER, G.; WEBER, J. Heat transfer during liquefaction and freezing-out of air in contercurrent-heatexchangers for helium-purification. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 16, n. 5, p. 542–544, 1990. Disponível em: http://fnt.ilt.kharkiv.ua/index.php/fnt/article/view/f16-0542e. Acesso em: 1 трав. 2024.