References for the numbering systems

Col	Reference

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

R1	Lindoff U. 1972, Astron. Astrophys. Suppl. 7,231

R2	Kjeldsen H., Frandsen S. 1991, Astron. Astrophys. Suppl. 87, 119

R3	Bruntt H., et al. 1999, Astron. Astrophys. Suppl. 140, 135

R4	Paunzen E., Maitzen H.M. 2002, Astron.Astrophys. 385, 867

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