References for the numbering systems

Col	Reference

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

R1	Hardorp J. 1960, Astr. Abh. Hamburg. Sternw. Bergedorf 5 no 7

R2	Netopil M., et al., 2006, A&A 454, 179

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

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