References for the numbering systems

Col	Reference

--- ---------

R1 Arp H.C., Sandage A., Stephens C. 1959, Astrophys. J. 130, 80

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 Hardorp J. 1960, Astr. Abh. Hamburg Bergedorf V no 7

R5 Lenham A.P., Franz O.G. 1961, Astron. J. 66,16

R6 Lavdovski V.V. 1962, Izv. Glavn. Astr. Obs. Pulkove 23, 122

R7 Lavdovski V.V. 1961, Trudy Glavn. Astr. Obs. Pulkove 73, 7

R8 Frolov V.N. 1975, Izv. Glavn. Astr. Obs. Pulkove no 193, 80

R9 Phelps R.L., Janes K.A. 1994, Astrophys. J. Suppl. 90, 31

R10 Stock J., Stock J. 1997, Rev. Mex. Astron. Astrofis. 33, 83


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