Col Reference--- ---------
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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 Onegina A. 1956, Izvestia Glav. Astr. Obs. 1, 61
R5 Mathews R.T. 1963, Publ. Goodsell Obs. no 14
R6 Tifft W.G. 1958, Astron. J. 63, 127
R7 Delgado A.J., Alfaro E.J. 2000, Astron. J. 119, 1848
R8 Kolaczkowski Z., et al. 2004, Acta Astron. 54, 33
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