[2] [2] Tsalmantza P, Kontizas M, Rocca-Volmerange B, et al. Astronomy & Astrophysics, 2009, 504(3): 1071.

[3] [3] Ball N M, Brunner R J. International Journal of Modern Physics D (IJMPD), 2010, 19(7): 1049.

[4] [4] Jain A K, Duin R P W, Mao Jianchang. IEEE Transactions on Pattern Analysis and Machine Intelligence, 2000, 22(1): 4.

[5] [5] Yip C W, Connolly A J, Vanden Berk D E, et al. The Astronomical Journal, 2004, 128(6): 2603.

[6] [6] Richards J W, Freeman P E, Lee A B, et al. The Astrophysical Journal, 2009, 691: 32.

[7] [7] Connolly A J, Szalay A S, Bershady M A, et al. The Astronomical Journal, 1995, 110(3): 1071.

[8] [8] McGurk R C, Kimball A E, et al. The Astronomical Journal, 2010, 139(3): 1261.

[9] [9] Vanderplas J, Connolly A. The Astronomical Journal, 2009, 138(5): 1365.

[12] [12] Levitin A. Introduction to the Design and Analysis of Algorithms, 2nd Editin. New Jersey: Addison Wesley/Pearson, 2007.

[13] [13] Abazajian K N, Adelman-McCarthy J K, Agüeros M A. The Astrophysical Journal Supplement, 2009, 182(2): 543.