[1] Zhao Yong-heng. Modern Physics, 2007, 19(5): 3.

[2] Bai L, Guo P, Hu Z Y. China Journal of Astronomy and Astrophysics,

     2005, 5(2): 203.

[3] Astronomical Society, 1998, 298(2): 361.

     Bailer-Jones C, Irwin M, Von Hippel T. Monthly Notices of Royal

[4] Monthly Notices of Royal Astronomical Society, 1994, 269(1): 97.

     Von Hippel T, Storrie-Lombardi L J, Storrie-Lombardi M C, et al.

[5] Journal, 1995, 110(3): 1071.

     Connolly A J, Szalay A S, Bershady M A, et al. Astronomical

[6] 1998, 332(2): 459.

     Gaspar Galaz, Valerie de Lapparent. Astronomy and Astrophysics,

[7] Zaritsky D, Zabludoff A I, Jeffrey A W. Astronomical Journal, 1995,

     110(7): 1602.

[9] Qin D M, Guo P, Hu Z Y, et al. China Journal of Astronomy and

     Astrophysics, 2003, 3(3): 277.

[10] Zhang Y, Zhao Y. Astronomy and Astrophysics, 2004, 422(3): 1113.

[11] Zhang Y, Zhao Y. PASP, 2003, 115(8): 1006.

[14] 492(1): 98.

     Glazebrook K, Offer A R, Deeley K. Astrophysical Journal, 1998,

[15] Parzen E. Annals of Mathematical Statistics, 1962, 33(3): 1065.

[16] Jones M C. Statistics and Probability Letters, 1990, 9: 129.

[17] Altman Naomi, Christian Leger. Journal of Statistical Planning and

     Inference, 1995, 46: 195.

[18] Patrick D G, William R S. Biometrics, 2004, 55(3): 769.