1. K. Wang,Trace Elements in Life Science, China Metrology Publishing House, Beijing, pp. 16–18 (1991) (in Chinese).
2. B. S. Guo, W. M. Zhu, B. K. Xiong, Y. J. Ji, Z. Liu, and Z. M. Wu,Rare Earths in Agriculture, China Agricultural Science and Technology Press, Beijing, p. 11 (1990) (in Chinese).
3. N. A. Danilov, Y. S. Krylov, G. V. Korpusov, and G. V. Kostikova, Scintillators based on ytterbium chloride adducts with neutral organophosphorus extractants for detecting solar neutrino for low-energy neutrino spectroscopy experiment,Radiochemistry 45, 128–133 (2003).
4. S. K. Sarkar, R. E. Rycyna, R. E. Lenkinski, H. A. Solleveld, and L. B. Kinter, Yb-DTPA, a novel contrast agent in magnetic resonance imaging: application to rat kidney,Magn. Reson. Med. 17, 328–335 (1991).
5. W. E Zhu, S. Q. Xu, P. P. Shao, et al., Investigation on intake allowance of rare earth: a study on bio-effect of rare earth in South Jiangxi,China Environ. Sci. 17(1), 63–66 (1997) (in Chinese).