References for the numbering systems

Col	Reference

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

R1 Kopf E. 1943, Astr. Nach. 274 no 2-3 -- Mitt. Hamburg 8 no 52 --

R2 Graff K. 1922, Astr. Nach. 217, 311

R3 Alcaino G. 1965, Lowell Obs. Bull. no 126

R4 Bannister R.D. 1918, Astron. J. 31, 165

R5 Herzog A.D., et al. 1975, Astron. Astrophys. Suppl. 19, 211


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