References for the numbering systems

Col	Reference

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

R1	Beauchamp A., et al 1994, Astrophys. J. Suppl. 93, 187 (seq. nos 1-518

R2	Bhatt B.C., et al. 1993, Bull. Astr. Soc. India 21, 33

R3	Handschel G. 1972, Ph.D. Thesis (Univ. Munster)

R4	Sandage A. unpublished pe sequence (quoted by Handschel)

R5	Subramaniam A., et al. 2006, Mon. Not. R. Astron. Soc. 370, 743

R6	Joshi H., et al. 2008, Mon. Not. R. Astron. Soc. 391, 1279 

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