1. Atwood, D.A., Platt, S.M., Cotton, S.A., Harrowfield, J.M., et al., The Rare Earth Elements: Fundamentals and Applications, Chichester: Wiley, 2012.
2. Brennan, J.G., in The Rare Earth Elements: Fundamentals and Applications, Atwood, D.A., Ed., Chichester: Wiley, 2012, p. 215.
3. Kataoka, T., Tsukahara, Y., Hasegawa, Y., and Wada, Y., Chem. Commun., 2005, no. 48, p. 6038.
4. Kar, S., Boncher, W.L., Olszewski, D., et al., J. Am. Chem. Soc., 2010, vol. 132, no. 40, p. 13960.
5. Selinsky, R.S., Han, J.H., Pe, E.A.M., and Guzei, I.A., J. Am. Chem. Soc., 2010, vol. 132, no. 21, p. 15997.