References for the numbering systems

Col	Reference

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R1 Kubiak M., et al. 1992, Acta Astron. 42, 155

R2 Phelps R.L., et al. 1994, Astron. J. 107, 1079

R3 Kyeong J.-M., Byun Y.-I. 2000, J. Korean Astron. Soc. 33, 143


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