References for the numbering systems

Col	Reference

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

R1	Lynga G. 1959, Ark. Astr. 2,379

R2	Andersen T.B., Reiz A. 1983, Astron. Astrophys. Suppl. 53, 181

R3	Stock J. 1984, Rev. Mex. Astr. Astrofis. 9, 127

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