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Vasen
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Wachsende Sekantenzahl
1970
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Zwei Ellipsoide Tangierend | two ellipsoide to be tangent
1986
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achsenparalleler irrweg (1)
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achsenparalleler irrweg (2)
1965
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around 1964-68
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around 1965
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1965-1968
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1965-1968