by Sun, Jing (晶孙), Zhao, Yi-Kun (懿琨 赵), Wang, Xin-Qiang (新强 王), Ren, Quan (诠任), Chen, Jing-Wei (经纬 陈), Zhang, Guang-Hui (光辉 张), Xu, Dong (东许), Wang, He-Zhou (河洲 汪)
Published in Chinese physics letters (01.10.2011)