1
by Gesundheit, S.
Published in Astronomische Nachrichten (1936)
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2
Published in Physik Journal (1958)
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3
Published in Physik Journal (1956)
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4
by Fahlenbrach, Hermann
Published in Physik Journal (1976)
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5
Published in forschung (2011)
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6
Published in forschung (2011)
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7