1. Arab Potash Company Ltd (2003) Annual report 2003. Public Shareholding Company, Amman
2. Ben-Amotz A (1982) Accumulation of β–carotene in halotolerant algae: purification and characterization of β–carotene-rich globules from Dunaliella bardawil (chlorophyceae). J Physiol 18:529–537
3. Editorial Committee of Climatological Atlas of the People’s Republic of China (2002) Climatological atlas of the People’s Republic of China. China Meteorological Press, Beijing. 7 (in Chinese)
4. Garpett DE (1991) Natural soda ash occurrences, processing and use. VNP, New York, pp 359–364
5. Garreff DE, Laborde M (1985) Salting out process for lithium recovery. In: Proceedings of the sixth international symposium on salt, 2, Toronto, Canada, pp 421–430