1. J. Liu, Q. Li, T. Wang, D. Yu, Y. Li, Angew. Chem. Int. Ed. 43 (2004) 5048 and reference therein
2. C. O’Dwyer, D. Navas, V. Lavayen, E. Benavente, M.A. Santa Ana, G. Gonza’lez, S.B. Newcomb, C.M. Sotomayor Torres, Chem. Mater. 18 (2006) 3016.
3. H. Xu, W. He, H. Wang, H. Yan, J. Cryst. Growth 260 (2004) 447.
4. X. Wu, Y. Tao, L. Dong, J. Hong, J. Mater. Chem. 14 (2004) 901.
5. J. Lui, X. Wang, Q. Peng, Y. Li, Adv. Mater. 17 (2005) 764