References for the numbering systems

Col	Reference

---	---------

R1	Keller S.C., Bessell M.S., Da Costa G.S. 2000, Astron. J. 119, 1748

R2	Vallenari A., Ortolani S., Chiosi C. 1994, Astron. Astrophys. Suppl. 108, 571

R3	Carney B.W., Janes K.A., Flower P.J. 1985, Astron. J. 90, 1196

R4	Robertson J.W. 1974, Astron. Astrophys. Suppl. 15, 261

R5	Arp H. 1959, Astron. J. 64, 254

R6	Pietrzynski G., Udalski A., et al. 1998, Acta Astron. 48, 175 

R7	Keller S.C., Wood P.R., Bessell M.S. 1999, Astron. Astrophys. Suppl. 134, 489

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