References for the numbering systems

Col	Reference

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

R1	Fenkart R.P., et al. 1977, Astron. Astrophys. Suppl. 30,307

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

R3	Moffat A.F.J., Vogt N. 1973, Astron. Astrophys. Suppl. 10, 135

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