References for the numbering systems

Col	Reference

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

R1	Kassis M., et al. 1997, Astron. J. 113, 1723

R2	Hawarden T.G. 1976, Mon. Not. R. Astr. Soc. 174,471

R3	Anthony-Twarog B.J., Twarog B.A. 1979, Astrophys. J. 233, 188

R4	Orr A. 1994, Travail de diplome (Uni. Geneve)

R5	Anthony-Twarog B.J., et al. 1994, PASP 106, 486

R6	Zloczewski K., et al. 2007, Mon. Not. R. Astron. Soc. 380, 1191

R7	Sestito P., et al. 2008, Astron. Astrophys. 488, 943

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