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 Becker W. et al. 1975, Basle Catalogue
R4 Latypov A.A. 1972, Circ. Tashkent Astron. Obs. 390, 10
R5 Mathews R.T. 1963, Publ. Goodsell Obs. no 14
R6 Kjeldsen H., Frandsen S. 1991, Astron. Astrophys. Suppl. 87, 119
R7 Ciechanowska A. et al. 2007, Acta Astron. 57, 249
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