References for the numbering systems

Col	Reference

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

R1	Gimenez A., Garcia-Pelayo J. 1980, Astron. Astrophys. Suppl. 41, 9

R2	Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17, 347  (Pe)

R3	Hoag A.A., et al. 1961, Publ. US Nav. Obs. 17, 347  (Pg)

R4	Gerasimenko T. 1991, Sov. Astron. 35, 553

R5	Bukowiecki L., et al. 2009, Open European Journal on Variable Stars 112, 1 

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