Der Aussagenkalkül und die Topologie
Alfred Tarski (1938)
Fundamenta Mathematicae
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Alfred Tarski (1938)
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Hadwiger, H., Kirsch, A. (1952)
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Endler, Otto (1960)
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Julius Schauder (1928)
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Karl Menger (1935)
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J. Schreier (1937)
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Peter Wintgen (1975)
Czechoslovak Mathematical Journal
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