References for the numbering systems

Col	Reference

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

R1	Webb R.A., et al. 1999, Astrophys. J. 512, L63

R2	Tachira K., et al. 2003, Astron. Nach. 324, 543

R3	Torres C.A.O., et al. 2000, Astron. J. 120, 1410

R4	Torres G., et al. 2003, Astron. J. 128, 825

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