References for the numbering systems

Col	Reference

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

R1	Bozkurt S. 1974, Rev. Mex. Astron. Astrofis. 1,89

R2	Bruck M.T., Smyth M.J., McLachlan A. 1968, Publ. R.O.E. 6, 209

R3	Loden L.O. 1979, Astron. Astrophys. Suppl. 38, 355 (field 2104)

R4	Twarog B.A., et al. 1993, Publ. Astron. Soc. Pacific 105, 78

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