[1] Cui X Q, Zhao Y H, Chu Y Q, et al. Research in Astronomy and Astrophysics, 2012, 12(9): 1197.
[2] Zhao G, Zhao Y H, Chu Y Q, et al. Research in Astronomy and Astrophysics, 2012, 12(7): 723.
[3] Luo A L, Zhang H T, Zhao Y H, et al. Research in Astronomy and Astrophysics, 2012, 12(9): 1243.
[4] Han J S, Luo A L, Zhao Y H. Publications of the Astronomical Society of Japan, 2011, 63(6): 1313.
[5] Wang F, Zhang H, Luo A, et al. Science China Physics, Mechanics and Astronomy, 2013, 56(10): 1833.
[6] Sanchez Almeide J, Aguerri J Al, Munoz-Tunon C, et al. The Astrophysical Journal, 2010, 714(1): 487.