Gu, Guoxian; Wang, Huihui; Liu, Pi; Fu, Chenzeng; Li, Zhonghua; Cao, Xuefeng; Li, Yunping; Fang, Qinghong; Xu, Feng; Shen, Jie; Wang, Peng George Chemical Communications, 2012, vol. 48, # 22 p. 2788 - 2790 doi: 10.1039/c1cc15851a