@article{article7e2511f1,
title   = {Preparation and characterization of purified Na-activated bentonite from Karak (Pakistan) for pharmaceutical use},
author = {Shah, Liaqat Ali and Khattak, Nazir Shah and Silva-Valenzuela, Maria das Graças da and Manan, A and Valenzuela Díaz, Francisco Rolando},
year = {2013},
doi = {10.1180/claymin.2013.048.4.03},
journal   = {Clay Minerals}
}