References for the numbering systems

Col	Reference

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R1 Thackeray A.D., et al. 1962, Mon. Not. R. Astr. Soc. 124,445

R2 Walker A.R., Coulson I.M. 1985, SAAO Circ. 9, 97

R3 Piatti A.E., et al. 1998, Astrophys. J. Suppl. 116, 263

R4 The P.S., et al. 1974, Astron. Astrophys. Suppl. 15, 141


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