4Brodusch N, Waters K, Demers H, et al. Ionic liquid - based observation technique for nonconductive materials in the scanning, electron microscope: Application to the characterization of a rare earth ore [ J ]. Microscopy Re- search and Technique, 2014, 77:225-235.
5Tian Jun, Yin Jingqun, Chi Ruan, et al. Kinetics on leaching rare earth from the weathered crust elution - deposited rare earth ores with ammonium sulfate solu- tion[ J ]. Hydrometallurgy, 2010, 101 (3 - 4 ) : 166- 170.
6Brodusch N, Waters K, Demers H, et al. Ionic liquid - based observation technique for nonconductive materi- als in the scanning electron microscope: Application to the characterization of a rare earth ore [ J ]. Microscopy Research and Technique, 2014, 77:225-235.
