References for the numbering systems

Col	Reference

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

R1 Cuffey J. 1941, Astrophys. J. 94, 55

R2 Becker W., et al 1976, Basel Katalogue

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

R6 Mostafa A.A., et al. 1983, J. Astron. Soc. Egypt 5, 23

R7 Claria J.J., et al. 1997, Astron. Astrophys. Suppl. 128, 131

R8 Kalirai J.S., et al. 2003, Astron. J. 126, 1402

R9 Sharma S. et al., 2006, Astron. J. 132, 1669


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