References for the numbering systems

Col	Reference

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

R1	Li Hen 1954, Ann. Obs. Astr. Zo-Se 23,1

R2	Tian K.P., et al. 1994, Astron. Astrophys. Suppl. 105, 15

R3	Zhao J.-l., et al. 1990, Ann. Shanghai Obs. No 11

R4	Chincarini G. 1963, Mem. Soc. Astron. Italiana 34, 23

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