Col Reference --- --------- R1 Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17,347 (pe) R2 Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17,347 (pg) R3 Pena J.H., Peniche R. 1994, Rev. Mex. Astr. Astrofis. 28, 139 Back to the form
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R1 Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17,347 (pe)
R2 Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17,347 (pg)
R3 Pena J.H., Peniche R. 1994, Rev. Mex. Astr. Astrofis. 28, 139