CHINESE PHYSICS LETTERS

WEN J, GUO H, YAN CH, WANG ZY, CHANG K, DENG P, ZHANG T, ZHANG ZD, JI SH, WANG LL, HE K, MA XC, CHEN X, XUE QK

NANOSCALE RESEARCH LETTERS

WANG ZS, ZHANG ZD, ZHANG R, LI H, FU DJ