References for the numbering systems

Col	Reference

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R1 Jones B.F., van Altena W.F. 1970, Astron. Astrophys. 9, 86

R2 Fenkart R.P. 1965, Mem. Soc. Astr. Italiana 36, 291

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 Hassan S.M. 1973, Astron. Astrophys. Suppl. 9, 261

R6 Tokhtasjev S.S. 1985, Izv. Astr. Obs. Ehngel'ardt no 51

R7 Peniche R., Pena J.H., et al. 1990, Rev. Mex. Astron. Astrofis. 20, 12


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