Col Reference--- ---------
R1 Steppe H. 1977, Astron. Astrophys. Suppl. 27, 415
R2 Moffat A.F.J., Vogt N. 1975, Astron. Astrophys. Suppl. 20, 125
R3 Schmidt H., Diaz santanilla G. 1974, Ver. Astr. Inst. Univ. Bonn no 71
R4 Gould B.A. 1897, Cordoba Photographs, cluster XXIV
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