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 de Graeve E. 1983, Vatican Obs. Publ. 2 no 4
R4 Zakharova P.E., Kazantseva O.I. 1980, Stellar Aggregates p.56
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