References for the numbering systems

Col	Reference

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R1 Grubissich C. 1975, Astron. Astrophys. Suppl. 21,99

R2 Petry C., et al. 1994, priv. comm.

R3 Phelps R.L., Janes K.A. 1994, Astrophys. J. Suppl. 90, 31

R4 Pietrukowicz P., et al., 2006, Acta Astron. 56, 267

R5 Yadav R.K.S., et al., 2008, Mon. Not. R. Astron. Soc. 388, 1879


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