KHAN, M.; RIAZ, M.; KHAN, K. ?EXTRACTION OF ALUMINA FROM NEPHELLINE SYENITE BY SINTERING WITH LIMESTONE. Biological Sciences - PJSIR, [S. l.], v. 39, n. 1-4, p. 25–27, 1996. Disponível em: https://v2.pjsir.org/index.php/biological-sciences/article/view/2360. Acesso em: 22 jul. 2024.