References for the numbering systems

Col	Reference

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

R1	Lynga G. 1959, Ark. Astr. 2,379

R2	Kubiak M. 1989, Acta Astron. 39, 153 (Table 2)

R3	Kubiak M. 1989, Acta Astron. 39, 153 (Table 1)

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