References for the numbering systems

Col	Reference

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

R1	Lindoff U. 1972, Astron. Astrophys. 16, 315

R2	Sanders W.L. 1972, Astron. Astrophys. 15, 368

R3	Becker W. 1947, Astr. Nach. 275, 171 - Mitt. Hambourg 8 no 60 -

R4	Barkhatova K.A., et al. 1978, in Star clusters and binary systems, p. 18

R5	Glushkova E., et al. 1999, Astron. Letters 25, 86

R6	Janes K., et al. 2013, Astron. J. 145, 7

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