Col Reference --- --------- R1 Fenkart R., et al. 1972, Astron. Astrophys. Suppl. 7,487 R2 Babu G.S.D 1985, J. Astrophys. Astron. 6, 61 Back to the form
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R1 Fenkart R., et al. 1972, Astron. Astrophys. Suppl. 7,487
R2 Babu G.S.D 1985, J. Astrophys. Astron. 6, 61