References for the numbering systems

Col	Reference

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

R1	Lindoff U. 1971, Astron. Astrophys. 15, 439

R2	Alter G. 1943, Mon. Not. R. Astr. Soc. 103, 10

R3	Gould B.A. 1897, Cordoba Photographs , amas XXXV

R4	McSwain M.V., Gies D.R., 2005, ApJS 161, 118

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