Col Reference --- --------- R1 Lindoff U. 1973, Astron. Astrophys. Suppl. 9,229 R2 Dodd R.J. 1977, Occasional Rep. R. Obs Edinburgh no 3 Back to the form
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R1 Lindoff U. 1973, Astron. Astrophys. Suppl. 9,229
R2 Dodd R.J. 1977, Occasional Rep. R. Obs Edinburgh no 3