Col Reference--- ---------
R1 Koelbloed D. 1959, Bull. Astr. Inst. Nethrl. 14, 265
R2 Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17, 347 (pe)
R3 Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17, 347 (pg)
R4 Pickering E.C. 1897, Harvard Coll. Ann. Obs. 26, 260
R5 Gould B.A. 1897, Cordoba Photographs, cluster XXXVI
R6 Constantine S.M., Harris B.J., Nikoloff I. 1969, Proc. ASA 1, 207
R7 Prosser C., Stauffer J.R., et al. 1995, Astron. J. 110, 1229
R8 James D.J., Jeffries R.D. 1997, Mon. Not. R. Astron. Soc. 291, 252
R9 James D.J., et al. 2000, ASP Conf. Ser. 198, 277
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