References for the numbering systems

Col	Reference

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

R1	Cannon R.D., Lloyd C. 1970, Mont. Not. R. Astr. Soc. 150, 27

R2	Sarma M.B.K., Walker M.F. 1962, Astrophys. J. 135, 11

R3	van Altena W., Jones B.F. 1970, Astron. Astrophys. 8, 112

R4	Stetson P.B. 2000, Publ. Astron. Soc. Pacific 112, 925

R5	Sharma S. et al., 2006, Astron. J. 132, 1669

R6	

R7	

R8	

R9	

R10	

R11	

R12	

R13	

R14	West F.R. 1967, Astrophys. J. Suppl. 14, 384

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