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  1. (1 other version)A simplification of takeuti's ordinal diagrams of finite order.Hilbert Levitz - 1969 - Mathematical Logic Quarterly 15 (7‐12):141-154.
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  • (1 other version)A simplification of takeuti's ordinal diagrams of finite order.Hilbert Levitz - 1969 - Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 15 (7-12):141-154.
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  • Ein konstruktives system von Ordinalzahlen.Kurt Schütte - 1968 - Archive for Mathematical Logic 11 (3-4):126-137.
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