References for the numbering systems

Col	Reference

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R1 Jankowitz N.E., McCosh C.J. 1963, MNASSA XXII, 18

R2 Lynga G. 1962, Ark. Astr. 3, 65

R3 Amieux G., Burnage R. 1981, Astron. Astrophys. Suppl. 44, 101

R4 Gould B.A. 1897, Cordoba Photographs, cluster XV

R5 Andersen T.B., Reiz A. 1983, Astron. Astrophys. Suppl. 53, 181

R6 Sagar R., Sharples R.M. 1991, Astron. Astrophys. Suppl. 88, 47

R7 Carraro G., F. Patat 2001, Astron. Astrophys. 379, 135

R8 Paunzen E., Pintado O.I., Maitzen H.M. 2003, Astron. Astrophys. 412, 721


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