References for the numbering systems

Col	Reference

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R1 Giorgi E.E., et al. 2001,Rev. Mex. Astron. Astrofis. 37, 1

R2 Moffat A.F.J., Vogt N. 1973, Astron. Astrophys. Suppl. 10,135

R3 Peterson C.J., Fitzgerald M.P. 1988, Mon. Not. R. Astron. Soc. 235, 1439


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