Col Reference--- ---------
R1 Lapasset E., et al. 2000, Astron. Astrophys. 361, 945
R2 Pesch P. 1961, Astrophys. J. 134,602
R3 Zug R.S. 1933, Lick Obs. Bull. 16, 119
R4 Joshi U.C., Sagar R. 1986, Bull. Astr. Soc. India 14, 95
R5 Choo K.J., Kim S.-L., et al. 2003, Astron. Astrophys. 399, 99
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