References for the numbering systems

Col	Reference

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

R1	Fenkart R.P., et al. 1972, Astron. Astrophys. Suppl. 7,487

R2	Moffat A.F.J., Vogt N. 1975, Astron. Astrophys. Suppl. 20, 85

R3	Carraro G., Costa E. 2007, Astron. Astrophys. 464, 573

Back to the form