References for the numbering systems

Col	Reference

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

R1 Lengauer G.G. 1937, Pulkovo Bull. XV no 126

R2 Mavers F.W. 1940, Astr. Abh. Hamburg Sternw. Bergedorf V no 4

R3 Becker W., Stock J. 1954, Z. Astrophys. 34, 1

R4 Zug R.S. 1933, Lick Obs. Bull. 16, 119

R5 Muminov M. 1985, Tsirk. Astron. Inst. Tashkent 116

R6 Mathews R.T. 1963, Publ. Goodsell Obs. no 14

R7 Jilinski E.G., et al. 2003, Astron. Astrophys. 401, 531


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