References for the numbering systems

Col	Reference

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R1 Steppe H. 1977, Astron. Astrophys. Suppl. 27, 415

R2 Schmidt H., Diaz Santanilla G. 1974, Ver. Astr. Inst. Univ. Bonn no 71

R3 Claria J.J. 1976, Astron. J. 81, 155

R4 Moffat A.F.J., Vogt N. 1975, Astron. Astrophys. Suppl. 20, 125

R5 Delgado A.J. et al. 2007, Astron. Astrophys. 467, 1397

R6 Piatti A.E., et al. 2010 Publ. Astron. Soc. Pacific 122, 516


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