References for the numbering systems

Col	Reference

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

R1 Oosterhoff P.T. 1937, Ann. Sterrw. Leiden 17 part 1

R2 Lavdovski V.V. 1961, Trudy Glavn. Astr. Obs. Pulkovo 73, 7

R3 Wildey R.L. 1964, Astrophys. J. Suppl. 8, 439

R4 Muminov M. 1982, Tsirk. Astr. Inst. no 98 (jjk)

R5 Pratt N.M. 1968, Publ. R. Obs. Edinburgh 6 no 4

R6 Marco A., Bernabeu G. 2001, Astron. Astrophys. 372, 477

R7 Maciejewski G. & Niedzielski A. 2007, Astron. Astrophys. 467, 1065

R8

R9 Keller S.C., et al. 2001, Astron. J. 122, 248

R10 Slesnick C.L., Hillenbrand L.A., Massey P. 2002, Astrophys. J. 576, 880

R11

R12

R13 Jung R. 1937, Veroeff. Univ. Sternw. Bonn no 31

R14 Moffat A.F.J., Vogt N. 1974, Veroeff. Astr. Inst. Univ. Bochum no 2


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