1. B. Velge, Green Clay Minerals, Ed. by T. Mackenzie (Elsevier, Treatise on Geochemistry, 2003), vol. 7, p. 309.
2. N. Guven, Hydrous Phyllosilicates. Reviews in Mineralogy, Vol. 19, Ed. by S. W. Bailey (Mineral Soc. Am., Washington, DC, 1991), p. 497.
3. G. B. Bokii, in Achievements of Science and Engineering, Ser. Crystal Chemistry, Vol. 31: Systematics of Natural Silicates (Kosmosinform, Moscow, 1997), p. 179 [in Russian].
4. Manual on Minerals, Vol. 4, No. 2 (Nauka, Moscow, 1992), p. 54 [in Russian].
5. A. I. Gorshkov, V. A. Drits, G. A. Dubinina, et al., Izv. Akad. Nauk, Ser. Geol., No. 9, 84 (1992).