References for the numbering systems

Col	Reference

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

R1	Larsson-leander G. 1957, Stockholm Obs. Ann. 20 no 2

R2	Hoag A.A., et al. 1961, Publ. US. Nav. Obs. 17, 347   (pe)

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

R4	Kerridge S.J., et al. 1973, Astron.J. 78, 53

R5	Bergdorfer Spektral Durchmusterung S.A. no 24

R6	Purgathofer A. 1964, Ann. Univ. Sternw. Wien 26 no 2

R7	Fang C. 1970, Astron. Astrophys. 4, 75

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