References for the numbering systems

Col	Reference

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

R1	Krzeminski W., Serkowski K. 1967, Astrophys. J. 147,988

R2	Foster D.C., et al. 2000, Astron. Astrophys. Suppl. 143, 409 (Table 7)

R3	Foster D.C., et al. 2000, Astron. Astrophys. Suppl. 143, 409 (Table 5)

R4	Foster D.C., et al. 2000, Astron. Astrophys. Suppl. 143, 409 (Appendix)

R5	Stock J. 1956, Astrophys. J. 123, 258

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