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1von: Ebbinghaus, Hermann[2022], Reprint 2021, De Gruyter
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2von: Aksix, V[2022], Reprint 2021, De Gruyter
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3von: Beyer, W[2022], Reprint 2021, De Gruyter
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4von: Biene, R. J. van[2022], Reprint 2021, De Gruyter