PHYSICS LETTERS A

ZOU DQ, SONG Y, XIE Z, LI ZL, WANG CK

NPG ASIA MATERIALS

GAO T, NG SW, LIU XQ, NIU LY, XIE Z, GUO RS, CHEN CJ, ZHOU XC, MA J, JIN W, CHUI YS, ZHANG WJ, ZHOU F, ZHENG ZJ