Col Reference --- --------- R1 Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17, 347 R2 Frolov V.N., et al., 2006, A&A 451, 901 Back to the form
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R1 Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17, 347
R2 Frolov V.N., et al., 2006, A&A 451, 901