References for the numbering systems

Col	Reference

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

R1	Ardeberg A., Maurice E. 1977, Astron. Astrophys. Suppl. 28,153

R2	Thackeray A.D., Wesselink AJ. 1965, Mon. Not. R. Astr. Soc. 131, 121

R3	McSwain M.V., Gies D.R., 2005, ApJS 161, 118

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