EVOLUTION OF SURFACE AREA OF CLAY TREATED WITH SULPHUROUS ACID AND ITS SUBSEQUENT ACTIVATION: Short Communications. Biological Sciences - PJSIR, [S. l.], v. 44, n. 1, p. 25–26, 2001. Disponível em: https://www.v2.pjsir.org/index.php/biological-sciences/article/view/1866. Acesso em: 10 mar. 2026.