Col Reference --- --------- R1 Hassan S.M. 1976, Astron. Astrophys. Suppl. 26,13 R2 Smyth M.J., Nandy K. Publ.R.Obs. Ed. 3 no 2 Back to the form
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R1 Hassan S.M. 1976, Astron. Astrophys. Suppl. 26,13
R2 Smyth M.J., Nandy K. Publ.R.Obs. Ed. 3 no 2