References for the numbering systems

Col	Reference

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

R1	Sanner J., et al. 2000, Astron. Astrophys. 357, 471

R2	del Rio G. 1980, Astron. Astrophys. Suppl. 42, 189

R3	Cuffey J. 1943, Astrophys. J. 97, 93

R4	Barkhatova K.A., et al. 1980, "Stellar Aggregates", Sverdlosk p. 27

R5	Piatti A.E., et al. 2003, Mon. Not. R. Astron. Soc. 340, 1249

R6	Kyeong J., Sung E.-C. 2005, J. Korean Astron. Soc. 38, 415 (BVI data)

R7	Kyeong J., Sung E.-C. 2005, J. Korean Astron. Soc. 38, 415 (UBVI data)

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