References for the numbering systems

Col	Reference

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

R1	del Rio G., Huestamendia G. 1988, Astr. Ap. Suppl. 73, 425

R2	Bronnikova N.M. 1958, Trudy Glavn. Astr. Obs. Pulkove 72, 77

R3	Frolov V.N., et al. 2002, Astron. Astrophys. 396, 125 (table 2)

R4	Frolov V.N., et al. 2002, Astron. Astrophys. 396, 125 (table 3)

R5	Frandsen S., Arentoft T. 1998, Astron. Astrophys. 333, 524

R6	Maciejewski G. & Niedzielski A. 2007, Astron. Astrophys. 467, 1065

R7	Bilir S., et al. 2010, Astrophys. Space Sci. 326, 139

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