MONTMORILLONITE SURFACE AS A CATALYST FOR THE FORMATION OF SAT METAL TETRA (P-SULPHOPHENYL) PORPHYRINS . J. Teknol. [Internet]. 2020 Oct. 21 [cited 2024 Nov. 21];82(6):1-9. Available from: https://journals.utm.my/jurnalteknologi/article/view/14564