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STEFFEN, Katrin. Occupation as Social Practice and Ambiguous Space: The Lives of Ludwik Hirszfeld and Jan Czochralski in Warsaw, 1939–44. Acta Poloniae Historica. Online. 8 August 2022. Vol. 125, pp. 99-132. [Accessed 1 July 2024]. DOI 10.12775/APH.2022.125.05.