KHAN, S.; KHAN, M. A.; HAQ, A. ul-. VACUUM HEAT TREATMENT OF ENGINEERING MATERIALS; THE TECHNICAL ASPECT. Biological Sciences - PJSIR, [S. l.], v. 44, n. 4, p. 248–252, 2001. Disponível em: http://www.biostaging.pjsir.org/index.php/biological-sciences/article/view/1936. Acesso em: 8 jun. 2025.