References for the numbering systems

Col	Reference

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

R1	Chincarini G. 1966, Mem. Soc. Astr. Italiana 37,423

R2	Zakharova P.E. 1978, in Star clusters and binary systems, p. 106

R3	Patat F., Carraro G. 1995, Astron. Astrophys. Suppl. 114, 281

R4	Maciejewski G. & Niedzielski A. 2007, Astron. Astrophys. 467, 1065

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