Col Reference --- --------- R1 Phelps R.L., Janes K.A. 1994, Astrophys. J. Suppl. 90, 31 R2 Battinelli P., et al. 1992, Astron. J. 103, 1596 R3 Alter G. 1944, MNRAS 104, 179 Back to the form
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R1 Phelps R.L., Janes K.A. 1994, Astrophys. J. Suppl. 90, 31
R2 Battinelli P., et al. 1992, Astron. J. 103, 1596
R3 Alter G. 1944, MNRAS 104, 179