References for the numbering systems

Col	Reference

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R1 Kustner F. 1923, Veroeff. Univ. Sternw. Bonn no 18

R2 Meurers J., Scharf K. 1957, Ver. Univ. Sternw. Bonn no 48

R3 Chincarini G. 1963, Contr. Asiago no 138

R4 Barkhatova K.A., Steinberg M.K. 1963, Collected Works in Astronomy, Sverdlosk, 1, 14

R5 Rosvick J.M., Balam D. 2002, Astron. J. 124, 2093

R6 Henden A. 2003, Sequence fields

R7 Andreuzzi G., et al. 2004, Mon. Not. R. Astron. Soc. 348, 297

R8 Maciejewski G. & Niedzielski A. 2007, Astron. Astrophys. 467, 1065


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