References for the numbering systems

Col	Reference

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

R1 Westerlund B.E., et al. 1988, Astron. Astrophys. Suppl. 76, 101

R2 Epstein I. 1968, Astron. J. 73, 556

R3 PSD 140

R4 Abraham de Epstein A.I., Epstein I. 1985, Astron. J. 90, 1211

R5 Micela G., et al. 1999, Astron. Astrophys. 344, 83

R6 Pillitteri I., et al. 2003, Astron. Astrophys. 399, 919 (seq. numbering)


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