[4] Bailey S W, Structures of Layer Silicates. In: Brindley G W, Brown G, eds., Crystal Structures of Clay Minerals and Their X-ray Identification. London: Mineralogical Society, 1980. 1.
[6] Choo C O, Kim S J. Clay and Clay Minerals, 2004, 52(6): 749.
[7] Johnston C T, Kogel J E, Bish D L, et al. Clay and Clay Minerals, 2008, 56(4): 470.