References for the numbering systems

Col	Reference

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

R1	Vasilevskis S., Rach R.A. 1957, Astron. J. 62, 175

R2	Larsson-Leander G. 1960, Stockholms Obs. Ann. 20 no 9

R3	Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17, 347  (pe)

R4	Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17, 347  (pg)

R5	Ancien no sequentiel remplace par ni LL+1000

R6	Stetson P.B. 2000, Publ. astron. Soc.Pacific 112, 925

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