4
5
6
7
8
by Schaefer-B, Wachner-P
Published in Sparkasse (1997)
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E-Article
9
10
by Schaefer, B. E.
Published in ApJL (1986)
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11
12
by Schaefer, B. E.
Published in The Astronomical Journal (1985)
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13
by Schaefer, B. E.
Published in ApJL (1985)
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E-Article
14
by Schaefer, B. E.
Published in ApJL (1983)
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15
16
17
19
20