References for the numbering systems

Col	Reference

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

R1	Villanova S., et al. 2004, Astron. Astrophys. 419, 149

R2	Zdanavicius K., Straizys V. 1990, Astrophys. Space Sci. 173, 309

R3	Maciejewski G. & Niedzielski A. 2007, Astron. Astrophys. 467, 1065

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