References for the numbering systems

Col	Reference

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

R1	Feinstein A., et al. 1973, Astron. Astrophys. Suppl. 12,331

R2	Feinstein A.1982, Astron. J. 87, 1012

R3	The P.S., et al. 1980, Astron. Astrophys. Suppl. 41, 93

R4	The P.S., Vleeming G. 1971, Astron. Astrophys. 14, 120

R5	Becker W., et al. 1976, Basel Katalogue

R6	Massey P., Johnson J. 1993, Astron. J. 105, 980

R7	Cudworth K.M., et al. 1993, Astron. J. 105, 1822

R8	Tapia M., et al. 2003, Mon. Not. R. Astron. Soc. 339, 44

R9	Carraro G., et al. 2004, Astron. Astrophys. 418, 525

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