References for the numbering systems

Col	Reference

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R1 Rahim M. 1970, Astron. Astrophys. 9, 221

R2 Malisheva L.K., et al. 1987, Investigations in Astr. and Geod. p. 3

R3 Babu G.S.D. 1991, J. Astrophys. Astr. 12, 187

R4 Clariá J.J., et al. 2007 Mon. Not. R. Astron. Soc. 379, 159


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