References for the numbering systems

Col	Reference

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

R1 Cox A.N. 1954, Astrophys. J. 119, 188

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 Loden L.O. 1957, Ark. Astr. 2, 39

R5 Ianna P.A., Adler D.S., Faudree E.F. 1987, Astron. J. 92, 347

R6 Andersen T.B., Reiz A. 1983, Astron. Astrophys. Suppl. 53, 181

R7 Geyer E.H., Nelles B. 1985, Astron. Astrophys. Suppl. 62, 301

R8 Gould B.A. 1897, Cordoba Photographs, cluster IV

R9 Amieux G. 1988, Astron. Astrophys. Suppl. 76, 305

R10 Harris G.L.H. et al., 1993, Astron. J. 106, 1533

R11 Romanishin W., Angel J.R. 1980, Astrophys. J. 235, 992

R12 Sharma S. et al., 2006, Astron. J. 132, 1669


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