References for the numbering systems

Col	Reference

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

R1	Hogg A.R. 1963, Mon. Not. R. Astr. Soc. 125,307

R2	The P.S., et al 1974, Astron. Astrophys. Suppl. 15,141 (no 30 to 39)

R3	Sagar R., Cannon R.D. 1997, Astron. Astrophys. Suppl. 122, 9

R4	Wooden W.H. II 1971, Publ. Warner and Swasey Obs. 1 no 2

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