Wang, L.M. “Preparation and Characterization of Ionic Liquild Modified Montmorillonite and Its Application in Poly(propylene) Montmorillonite Nanocomposites”. Asian Journal of Chemistry, vol. 23, no. 6, Mar. 2011, pp. 2759-61, https://asianpubs.org/index.php/ajchem/article/view/10490.