1. Eti, 2007 Year Annual Report Eti Mine Works General Management, Turkey, 2007
2. C. Helvacı, R.N. Alonso, Turkish. J. Earth Sci. 9, 1 (2000)
3. O. Baysal, Bull. Mineral. Res. Expl. Ins. Turk. 79, 22 (1972)
4. H. Gülensoy, T. Teberdar, Bull. Mineral. Res. Expl. Ins. Turk. 79, 30 (1972)
5. B. Caifeng, A. Xiaokang, F. Yuhua, B. Shuangyu, X. Sitan, J. Chil. Chem. Soc. 4, 1291 (2007)