Col Reference --- --------- R1 Vazquez R.A., et al. 2003, Rev. Mex. Astron. Astrofis. 39, 89 R2 Peterson C.J., FitzGerald M.P. 1988, MNRAS 235, 1439 R3 Paunzen E., et al. 2006, Astron. Astrophys. 454, 171 Back to the form
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R1 Vazquez R.A., et al. 2003, Rev. Mex. Astron. Astrofis. 39, 89
R2 Peterson C.J., FitzGerald M.P. 1988, MNRAS 235, 1439
R3 Paunzen E., et al. 2006, Astron. Astrophys. 454, 171