References for the numbering systems

Col	Reference

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R1 McClure R.D., et al. 1981, Astrophys. J. 243,841

R2 Purgathofer A. 1964, Ann. Univ. Sternw. Wien 26 no 2

R3 Marconi G., et al. 1997, Mon. Not. R. Astron. Soc. 291, 763

R4 Kim S.L., et al. 2001, Acta Astron. 51, 49


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