References for the numbering systems

Col	Reference

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

R1	Phelps R.L., et al. 1994, Astron. J. 107, 1079

R2	Handschel G. 1972, Thesis (Univ. Munster)

R3	Mohan V. et al. 1992, Bull. Astr. Soc. India 20, 303 (Northern field)

R4	Mohan V. et al. 1992, Bull. Astr. Soc. India 20, 303 (Southern field)

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