References for the numbering systems

Col	Reference

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R1 Arp H., Cuffey J. 1962, Astrophys. J. 136,51

R2 Cuffey J. 1938, Ann. Harvard Coll. Obs. 106, 64

R3 Christian C., et al. 1985, Astrophys. J. 299, 683

R4 Kharchenko N., et al. 1997, Astron. Nachr. 318, 253

R5 Carraro G., et al. 2002, Mon. Not. R. Astr. Soc. 332, 705


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