Col Reference --- --------- R1 The P.S., et al. 1982, Astrophys. Lett. 22, 109 R2 Vazquez R.A., Baume G. 2001, Astron. Astrophys. 371, 908 Back to the form
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R1 The P.S., et al. 1982, Astrophys. Lett. 22, 109
R2 Vazquez R.A., Baume G. 2001, Astron. Astrophys. 371, 908