Col Reference--- ---------
R1 Phelps R.L., Janes K.A., Montgomery K.A. 1994, Astron. J. 107, 1079
R2 Durgapal A.K., Pandey A.K., Mohan V., 2001, Astron. Astrophys. 372, 71
R3 Maciejewski G. & Niedzielski A. 2007, Astron. Astrophys. 467, 1065
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