?A STUDY OF PAKISTANI GYPSUM BY X-RAY POWDER DIFFRACTION. Biological Sciences - PJSIR, [S. l.], v. 39, n. 5-8, p. 110–113, 1996. Disponível em: http://www.v2.pjsir.org/index.php/biological-sciences/article/view/2385. Acesso em: 25 apr. 2026.