Fatimah, I., Narsito, N. and Wijaya, K. 2013. Effect of Aluminium Content in Aluminium Pillared Montmorillonite on Its Surface Acidity Properties. Journal of Mathematical and Fundamental Sciences. 43, 2 (Jul. 2013), 123-138. DOI:https://doi.org/10.5614/itbj.sci.2011.43.2.5.