Col Reference --- --------- R1 Grice N.A., Dawson D.W. 1990, Astron. J. 102, 881 R2 Lindoff U. 1971, Astron. Astrophys. 15,439 R3 Chun M.-Y., Lee S.-W. 1996, 30, 137 Back to the form
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R1 Grice N.A., Dawson D.W. 1990, Astron. J. 102, 881
R2 Lindoff U. 1971, Astron. Astrophys. 15,439
R3 Chun M.-Y., Lee S.-W. 1996, 30, 137