Col Reference--- ---------
R1 Barkhatova K.A. 1957, Soviet. Astr. 1, 882
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
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14 Moffat A.F.J., Vogt N. 1974, Veroeff. Astr. Inst. Univ. Bochum no 2
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