After he refused to sign (without modification) the Oath of Loyalty to Adolf Hitler, going back to Switzerland and becoming a professor in Basel (1935–1962)
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After he refused to sign (without modification) the Oath of Loyalty to Adolf Hitler, going back to Switzerland and becoming a professor in Basel (1935–1962)
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-21 from Wikipedia. The archived copy is preserved so this citation survives link rot.