References for the numbering systems

Col	Reference

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

R1	Johnson H.L. 1960, Astrophys. J. 131, 620

R2	Sandage A.R. 1960, Astrophys. J. 131, 610

R3	Wampler E., et al. 1961, Astrophys. J. 133, 895

R4	Alter G. 1943, Mon. Not. R. Astr. Soc. 103, 9

R5	van den Bergh S. 1978, Astron. J. 83, 1174

R6	Vyssotsky A.N., Williams E.T.R. 1948, Publ. Leander McCormick Obs. X,5

R7	Francic S.P. 1989, Astron. J. 98, 888

R8	Pedreros M. 1984, Thesis (Univ. Toronto)

R9	

R10	

R11	

R12	

R13	

R14	

R15	Landolt A.U. 1964, Astrophys. J. Suppl. VIII, 329

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