Col Reference--- ---------
R1 Vasilevskis S., Balz A.G.A. 1959, Astr. J. 64, 170
R2 Cuffey J. 1938, Harvard Coll. Obs. Ann. 106, 39
R3 Francic S.P. 1989, Astron. J. 98, 888
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14 Alcaino G. 1967, Astrophys. J. 147, 112
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