4Abdulla W,AI-Shawi.Determination of thorium and uranium in nitrophosphate fertilizer solution by ion chromatography[J].Journal of Chromatography A.1995(706):175-181.
5Kurandt A.The VEBA Phosphoric Acid Process[C],//Processing of the ISMA Technical Conference.Hauge.Nethedand:[s.n.],1976:318-321.