Shi, Yongheng; Xu, Huaqiang; Liu, Bingni; Kong, Weiling; Wei, Qunchao; Xu, Weiren; Tang, Lida; Zhao, Guilong Monatshefte fur Chemie, 2013, vol. 144, # 12 p. 1903 - 1910 doi: 10.1007/s00706-013-1053-0