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Twentieth Century, Princeton, NJ: Princeton University Press, ISBN 978-1-400-85052-5 Lagarde, Paul de (1884), "Woher stammt das x der Mathematiker?", Mittheilungen...

the Early Twentieth Century. Princeton University Press. p. 105. ISBN 9781400850525. Archived from the original on 2 July 2023. Retrieved 1 October 2018...