1. Liu L L, Tsai C W, Hwang T 2012 Int. J. Theor. Phys. 51 2291
2. Du J Z, Sun Y, Qin S J, Wen Q Y, Zhu F C 2008 Acta Phys. Sin. 57 4694 (in Chinese) [杜建忠, 孙莹, 秦素娟, 温巧燕, 朱甫臣 2008 物理学报 57 4694]
3. Hillery M, Buzek V, Berthiaume A 1999 Phys. Rev. A 59 1829
4. Zhang J, Wang F Q, Zhao F, Lu YQ, Liu S H 2008 Acta Phys. Sin. 57 4946 (in Chinese) [张 静, 王发强, 赵 峰, 路轶群, 刘颂豪 2008 物理学报 57 4946]
5. Zhu Z C, Zhang Y Q, Fu A M 2012 Chin. Phys. B 21 010307