- ... (1983)1
- in ApJ, Vol. 266, p. 713-717 (note that there is a
sign error in the formula given in the paper)
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- ... (1992)2
- in The Astronomy and Astrophysics
Encyclopedia, ed. by Maran, p. 403-407
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- ... by3
- for FOCA magnitudes, replace -1.3 with -1.2
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