by He, Xiao-Yang (晓阳 何), Chen, Qi (椅陈), Li, Lin-Cui (林翠 李), Yang, Chun (春杨), Li, Biao (彪李), Zhou, Bang-Hua (邦华 周), Tang, Chuan-Xiang (传祥 唐)
Published in Chinese physics letters (01.05.2011)